Timeline of vitamin D

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This is a timeline of vitamin D, attempting to describe significant and illustrative events in the history of vitamin D.

Sample questions

The following are some interesting questions that can be answered by reading this timeline:

  • What are some important events preceeding the discovery of vitamin D?
    • Sort the full timeline by "Event type" and look for the group of rows with value "Prelude".
    • You will see some important events related to the history of vitamin D, like the first description of rickets, and early treatments involving vitamin D, such as cod liver oil.
  • What are some health conditions related to vitamin D named in this timeline?
    • Sort the full timeline by "Related health condition (when applicable)".
    • You will see a range of conditions, often rickets, but also cancer and kidney disease, among others.
  • What are some significant or illustrative studies being conducted on Vitamin D?
    • Sort the full timeline by "Event type" and look for the group of rows with value "Research".
    • You will see a variety of studies of different types, from cohort studies indicating the effect of vitamin D in subjects, to laboratory studies such as molecular cloning.
  • What are some Vitamin D recommended intakes published by competent institutions?
    • Sort the full timeline by "Event type" and look for the group of rows with value "Recommendation".
    • Check table of recommendations for vitamin D for adults in Canada and United States.
  • What are some vitamin D-related drugs having been launched to the market?
    • Sort the full timeline by "Event type" and look for the group of rows with value "Drug launch".
    • You will see a list of marketed analogs of vitamin D.
  • What are some illustrative books specializing in vitamin D?
    • Sort the full timeline by "Event type" and look for the group of rows with value "Literature".
    • You will see a number of publications, some by notable authors such as Michael F. Holick.

Big picture

Time period Development summary More details
2nd century–1890s Recognition & empiricism Vitamin D history begins as a clinical problem long before a biochemical explanation exists. Physicians in antiquity and early modern Europe identify rickets as a distinct childhood bone disorder, carefully describing its deformities and prevalence. By the 18th and 19th centuries, cod liver oil becomes an established empirical treatment for both rickets and tuberculosis, despite ignorance of its active component. Observational insights gradually accumulate: children in crowded, sun-poor urban environments are disproportionately affected, while those in sunnier regions are largely spared. These patterns lead to early hypotheses about sunlight as a protective factor. By the late 19th century, rickets is well defined clinically, effective remedies exist, and environmental determinants are suspected—but the underlying substance and mechanism remain unknown.
1890s–1937 Vitamin discovery & UV biology This period transforms scattered observations into nutritional science. The emergence of the vitamin concept enables researchers to classify “accessory food factors” essential for health. Experiments distinguish vitamin D from vitamin A and show that cod liver oil contains a rickets-preventing factor resistant to heating. Parallel work demonstrates that ultraviolet light alone can cure rickets, implying endogenous synthesis. Animal models reveal that skin irradiation generates a precursor later stored in tissues. By the early 1930s, vitamin D₂ is purified and crystallized, and its chemical structure clarified. The isolation of 7-dehydrocholesterol and identification of vitamin D₃ as the natural skin-derived form complete the discovery phase. Vitamin D is now recognized as both diet-derived and sunlight-generated.[1]
1940s–late 1970s Endocrine system & regulation With rickets largely controlled, research shifts from discovery to mechanism, safety, and policy. Governments establish intake recommendations and fortification programs, but excessive dosing leads to toxicity episodes, forcing reassessment of public health strategies. Mechanistic advances overturn the belief that vitamin D acts directly: it is shown to undergo liver and kidney activation and to function like a steroid hormone. Key metabolites, including calcifediol and calcitriol, are identified, along with specific nuclear receptors mediating gene regulation. Vitamin D becomes understood as a tightly regulated endocrine system central to calcium homeostasis, bone metabolism, and neuromuscular function. Definitive proof of cutaneous vitamin D₃ synthesis resolves long-standing debates, marking the conceptual maturation of vitamin D biology.
1980s–2025 Expansion, controversy & precision From the 1980s onward, vitamin D research expands beyond bone into cancer, immunity, cardiovascular disease, autoimmunity, and aging. Epidemiological studies link low vitamin D levels to diverse chronic conditions, while laboratory work reveals receptor expression across many tissues. Vitamin D analogs enter clinical use for kidney disease, psoriasis, and osteoporosis. However, large randomized trials increasingly show mixed or context-dependent benefits, challenging earlier optimism. Evidence accumulates that responses vary by baseline deficiency, age, BMI, pregnancy status, and comorbidities. Recent guidelines favor conservative supplementation for healthy adults while recognizing benefits in specific populations. Contemporary research emphasizes personalized dosing, metabolic complexity, and mechanistic pathways, reframing vitamin D as neither panacea nor trivial nutrient, but a context-sensitive biological regulator.

Full timeline

Year Related health condition (when applicable) Event type Details Location/researcher affiliation
2nd century AD Rickets Clinical description Soranus of Ephesus describes a condition in Roman children consistent with rickets, later understood as caused by vitamin D deficiency.[2] Roman Empire
1650 Rickets Clinical description Francis Glisson provides a detailed clinical description of rickets, establishing it as a distinct disease entity.[3] United Kingdom
1770 Tuberculosis Therapeutic practice Cod liver oil is advocated for the treatment of tuberculosis. It is later recognized as a rich source of vitamin D.[4]
1822 Rickets Hypothesis (etiology) Jędrzej Śniadecki proposes that lack of sunlight exposure is a cause of rickets, anticipating the role of ultraviolet radiation in vitamin D synthesis.[5] Poland
1824 Rickets Therapeutic practice Cod liver oil is prescribed by D. Scheutte for the treatment of rickets, representing early nutritional therapy.[3]
1849 Tuberculosis Clinical evidence (observational) Charles Theodore Williams reports improved outcomes in patients with tuberculosis treated with cod liver oil, contributing to its wider therapeutic adoption.[6] United Kingdom
1890 Rickets Epidemiologic observation Theodore Palm observes that children living in equatorial regions rarely develop rickets, suggesting a protective role of sunlight exposure.[7] United Kingdom
1903 Tuberculosis Therapeutic discovery (phototherapy) Niels Ryberg Finsen is awarded the Nobel Prize in Physiology or Medicine for demonstrating that ultraviolet light can treat cutaneous tuberculosis, providing early evidence of the biological effects of UV radiation.[8] Denmark
1906 Rickets Conceptual advance (nutrition science) Frederick Gowland Hopkins proposes that diets contain essential accessory factors required to prevent diseases such as scurvy and rickets, anticipating the discovery of vitamins.[3][9] United Kingdom
1912 Conceptual advance Frederick Gowland Hopkins helps formalize the concept of vitamins as essential dietary factors.[2] United Kingdom
1913 Discovery / identification Elmer McCollum and Marguerite Davis identify vitamin A, advancing the concept of fat-soluble vitamins and enabling later differentiation of vitamin D.[10] United States
1914 Rickets Experimental research (animal study) Elmer McCollum and colleagues show that oxidized cod liver oil loses anti-xerophthalmic activity but retains anti-rachitic effects, demonstrating that vitamin A and the anti-rickets factor (later identified as vitamin D) are distinct substances.[8][11] United States (University of Wisconsin–Madison)
1919 Rickets Experimental research (animal study) Edward Mellanby induces rickets in dogs through diet and lack of sunlight, and shows that cod liver oil prevents the disease.[12] United Kingdom
1921 Rickets Epidemiologic observation Alfred Hess and Lester Unger report that the incidence of rickets varies seasonally, correlating with sunlight exposure.[3]
1922 Rickets Discovery/identification American biochemist Elmer McCollum at Johns Hopkins University discovers Vitamin D from cod liver oil as a dietary substance that could prevent rickets.[13] United States
1922 Rickets Clinical evidence (observational) British microbiologist Hariette Chick and her co-workers, working with malnourished children in a clinic in Vienna, show that rickets prevalent in the children could be cured by whole milk or cod-liver oil.[3] Austria
1923 Rickets Mechanism/pathway Harry Goldblatt and Katharine Marjorie Soames show the conversion of a precursor to vitamin D in the skin under the effect of ultraviolet light. They also observe that livers of irradiated rats are curative when fed to rachitic rats.[14][2]
1926 Rickets Mechanism / pathway Rosenheim and Webster, at a meeting of the Biochemical Society in London, announce that “the precursor of vitamin D is not cholesterol itself, but a substance which is associated with and follows ‘chemically pure' cholesterol in all its stages of purification by the usual methods (saponification and recrystallization).”[3] United Kingdom
1928 Tooth decay Clinical evidence (observational) An experiment by Mellanby and Pattison with children finds that oral vitamin D intake reduces the risk of dental caries.[13] United Kingdom
1930 Rickets, Vitamin D deficiency Drug / analog development Vitamin D prodrug dihydrotachysterol is developed as a method of stabilizing the triene structure of one of the photoisomers of vitamin D. This represents the oldest vitamin D analog.[15] Germany
1931 Vitamin D deficiency Discovery / identification Vitamin D2 is independently purified and crystallized by researchers in London and the Netherlands.[8][3] United Kingdom, Netherlands
1932 Vitamin D deficiency Discovery / identification The structure of vitamin D is identified when Askew et al. manage to isolate vitamin D2 from a mixture of ergosterol (a compound found in fungi).[12] United Kingdom
1933 Rickets, Vitamin D deficiency Drug / analog development Holtz develops dihydrotachysterol,[16] a synthetic analog of vitamin D that does not require renal activation like vitamin D2 or vitamin D3.[17] Germany
1936 Rickets, Vitamin D deficiency Discovery / identification Cholecalciferol is identified and characterized. Also known as vitamin D3, it is a form of vitamin D produced in the skin under ultraviolet exposure; it is also found in some foods and can be taken as a dietary supplement.[18][19] Germany
1936 Skin cancer Epidemiologic observation S. Peller observes that U.S. Navy personnel who experiences skin cancer has a much lower incidence of nonskin cancers. This leads him to hypothesize that the development of skin cancer confers protection against other cancers. This marks the beginning of the emergence of the epidemiologic role of sunlight in cancer prevention.[7] United States
1937 Rickets Clinical evidence (observational) The term "rickets resistant to vitamin D" is coined by Albright et al., as the patients they describe present with changes in mineral metabolism that could only be overcome by very large daily doses of vitamin D.[2]
1935 Discovery / identification Researchers led by German chemist Adolf Windaus isolate 7-dehydrocholesterol, a key precursor in vitamin D biology.[20] Germany
1937 Discovery / identification Vitamin D₃ is identified by Adolf Windaus and Franz Bock as the natural form of vitamin D produced in human skin through ultraviolet irradiation of 7-dehydrocholesterol. This discovery prompts debate over whether vitamin D is primarily dietary or endogenously synthesized. Although skin production is inferred at the time, direct proof would come only in 1978, when vitamin D₃ is isolated using mass spectrometry.[20][10] Germany
1940 Guideline / recommendation The first recommendation for vitamin D is established in the United States, determining the value of 400 IU (i.e., the lower value of a range for infants at the time); for adults, a footnote states that “when not available from sunshine, [vitamin D] should be provided up to the minimal amounts recommended for infants”.[15] United States
1946 Lupus vulgaris Clinical evidence (observational) Dowling et al. report the treatment of patients with lupus vulgaris with oral vitamin D. Eighteen of 32 patients appear to be cured, with nine improved.[8]
1952 Vitamin D deficiency Industrial production / drug availability Synthetic vitamin D2 and D3 compounds begin to be produced at scale.[21]
1952 Calcium homeostasis, Bone metabolism Mechanism / pathway Arvid Carlsson, Heinz Bauer and colleagues demonstrate that vitamin D does not directly induce mineral deposition in bone but instead mobilizes calcium from bone into the bloodstream, highlighting its central role in maintaining serum calcium homeostasis and supporting neuromuscular function.[20] Sweden
1953–1955 Hypercalcemia, Vitamin D toxicity Safety signal Nutrition surveys indicate that British infants could ingest up to 4,000 IU of vitamin D daily from multiple sources, coinciding with numerous cases of infantile hypercalcemia. Subsequent changes in food fortification policies reduce the incidence.[22] United Kingdom
1955 Vitamin D deficiency Mechanism / pathway The complete photochemical and thermal reaction sequence from ergosterol to calciferol is elucidated by Velluz et al.[3] France
1957 Rickets, Vitamin D deficiency Guideline / recommendation The American Medical Association’s Council on Foods and Nutrition recommends that milk contain 400 IU (10 μg) of vitamin D per quart and that its content be independently verified at least twice yearly.[15] United States
1960 Calcium homeostasis, Bone metabolism Mechanism / pathway 25,26-dihydroxyvitamin D3 becomes the first identified dihydroxylated metabolite of vitamin D3, demonstrating intestinal calcium transport activity.[23][24] United States
1960s Skin cancer Epidemiologic observation Increasing incidence rates of skin cancer are reported, contributing to the emergence of large-scale sun-safety campaigns.[15]
1960s Supravalvular stenosis Hypothesis During this time, vitamin D is considered the cause of supravalvular stenosis.[15] The published hypothesis is that “toxic” amounts of vitamin D during pregnancy gave rise to a clinical condition titled “infantile hypercalcemia syndrome”.[25]
1963 Guideline / recommendation The American Academy of Pediatrics (AAP) Committee on Nutrition and the Food and Drug Administration establish a daily recommended intake of vitamin D of 10 μg (400 IU) for infants and children, standardizing earlier recommendations and reinforcing its role in preventing deficiency.[26][27][2] United States
1965–1975 Mechanism / pathway During this period, the key elements of the vitamin D endocrine system regulating calcium and phosphorus metabolism are elucidated.[28] United States
Mid–1960s Assay / standardization New techniques using radioactively labeled compounds are developed, enabling researchers to trace vitamin D metabolism in living organisms.[2] United States
1966 Receptor / gene regulation Wasserman and colleagues discover a vitamin D–dependent calcium-binding protein in the intestines of chicks, providing early evidence of molecular mediators of vitamin D action.[10] United States
1967 Hypothesis Loomis suggests that melanin pigmentation evolved as protection against excessive vitamin D production due to high sunlight exposure.[15] United States
1968 Mechanism / pathway A team led by Hector DeLuca at the University of Wisconsin isolates 25-hydroxyvitamin D3 and demonstrates that it is produced in the liver, establishing that vitamin D requires metabolic activation. This overturns the prior assumption that vitamin D acts directly and marks a major conceptual shift toward understanding vitamin D as a hormonally regulated system.[2][20] United States
1968 Kidney disease Hypothesis (endocrine function) The idea emerges that vitamin D functions as a steroid-like hormone, particularly in the context of renal physiology and calcium regulation.[21] United States
1968–1971 Mechanism / pathway Rapid advances clarify the metabolic processing of vitamin D and its physiological activity, laying the foundation for the vitamin D endocrine system.[2] United States
1969 Calcium homeostasis, Vitamin D deficiency Receptor / gene regulation The vitamin D receptor (VDR) is identified in the intestines of vitamin D–deficient chicks, providing early evidence of receptor-mediated action.[21] United States
1969 Calcium homeostasis, Bone metabolism Mechanism / pathway The chemical synthesis of calcifediol (25-hydroxyvitamin D3) is achieved by J. W. Blunt and Hector DeLuca.[10][29] United States
1971 Calcium homeostasis, Bone metabolism Discovery / identification Calcitriol (1,25-dihydroxyvitamin D3), the hormonally active form of vitamin D, is identified by Michael F. Holick and colleagues in the laboratory of Hector DeLuca.[30][31] United States
1971 Calcium homeostasis, Bone metabolism Mechanism / pathway D. R. Fraser and E. Kodicek identify the kidney as the site of synthesis of calcitriol, completing the liver–kidney activation pathway.[32] United Kingdom
1972 Calcium homeostasis, Bone metabolism Mechanism / pathway The chemical synthesis of 1α,25-(OH)2D3 (calcitriol) is achieved.[10] United States
1974 Rheumatoid arthritis, Osteoporosis, Vitamin D deficiency Clinical evidence (observational) Vitamin D deficiency is reported in postmenopausal women with rheumatoid arthritis who have sustained fractures compared with those who have not.[33] United Kingdom
1974 Calcium homeostasis Receptor / gene regulation The existence of a chromosomal receptor for vitamin D is demonstrated.[2] United States
1975 Calcium homeostasis Receptor / gene regulation Mark Haussler identifies a nuclear receptor that binds calcitriol in intestinal cells, confirming receptor-mediated action.[2][34] United States
1977 Vitamin D deficiency Discovery / identification A water-soluble form of vitamin D (vitamin D sulfate) is identified in human milk, suggesting that breast-fed infants may receive sufficient vitamin D without supplementation.[26] United Kingdom
1978 Vitamin D deficiency, Calcium homeostasis Mechanism / pathway Definitive proof is obtained that vitamin D3 is synthesized in human skin, through isolation and identification using mass spectrometry, confirming ultraviolet-induced production in vivo.[20] United States
1979 Calcium homeostasis, Bone metabolism Literature (scholarly / popularization) Anthony W. Norman publishes Vitamin D: The Calcium Homeostatic Steroid Hormone, synthesizing the emerging view of vitamin D as an endocrine regulator of calcium metabolism.[35] United States
1980 Vitamin D deficiency, Calcium homeostasis Mechanism / pathway Michael F. Holick and colleagues elucidate the full sequence of photochemical steps leading to the synthesis of cholecalciferol in human skin, establishing the detailed mechanism of cutaneous vitamin D production.[3][36][13] United States
1980 Short gestation and low birth weight Clinical trial (RCT) O. G. Brooke et al. conduct a randomized trial in pregnant Asian women in England, reporting a modest increase in birth weight with vitamin D supplementation.[37] United Kingdom
1980 Cancer Hypothesis Cedric Garland and Frank C. Garland propose the solar UVB–vitamin D–cancer hypothesis, initially focused on colon cancer and later extended to multiple cancers.[38] United States
1980 Hypocalcemia, secondary hyperparathyroidism, osteodystrophy, rickets, osteomalacia Drug / analog introduction Alfacalcidol is introduced in Canada as a vitamin D analogue used in the management of hypocalcemia and renal osteodystrophy.[39] Canada
1980 Cancer (colon cancer) Epidemiologic observation Garland and Garland report a positive association between latitude and colon cancer mortality, proposing vitamin D and calcium as protective factors.[7][40] United States
1981 Birth weight Clinical trial (RCT) R. K. Marya et al. report increased birth weight in infants born to mothers receiving vitamin D supplementation during pregnancy.[41] India
1981 Cardiovascular disease Hypothesis Robert Scragg proposes that sunlight exposure and vitamin D may protect against cardiovascular disease, based on ecological patterns of disease incidence.[42] Australia
1981 Cancer (melanoma, leukemia) Mechanism / pathway Studies by David Feldman and Tatsuo Suda demonstrate that calcitriol inhibits proliferation of melanoma cells and induces differentiation of leukemic cells, expanding vitamin D’s role beyond calcium metabolism.[15] United States, Japan
1981 Cystic fibrosis Clinical evidence (observational) Reduced vitamin D–binding protein levels are reported in individuals with cystic fibrosis.[8] United States
1982 Rickets Receptor / gene regulation The role of the vitamin D receptor in vitamin D–dependent rickets type II is established.[2] United States
1983 Epidemiologic observation S. H. Sedrani et al. report unexpectedly low vitamin D levels in Saudi university students and elderly subjects, suggesting widespread deficiency in the population.[43] Saudi Arabia
1984 Kidney disease Clinical evidence (observational) B. P. Halloran et al. provide evidence supporting correction of impaired 25(OH)D availability in chronic kidney disease.[44] United States
1984 Breastfeeding Experimental research (human study) Greer et al. show that maternal UVB exposure significantly increases vitamin D content in human milk, peaking at 48 hours and returning to baseline within 7 days.[45] United States
1984 Safety signal Narang et al. report that daily intake of 2,400 IU of vitamin D increases serum calcium levels without reaching hypercalcemia.[15] India
1985 Tuberculosis, pulmonary disease Clinical evidence (observational) A study of Indonesian patients with active tuberculosis finds that higher baseline calcifediol levels are associated with less severe pulmonary disease.[8] Indonesia
1985 Tuberculosis Epidemiologic observation Davies reports increased rates of active tuberculosis among migrants to the United Kingdom, potentially linked to reduced sun exposure and resulting vitamin D deficiency.[8] United Kingdom
1985 Psoriasis Clinical evidence (observational) Morimoto and Kumahara report remission of psoriatic lesions in a patient treated with 1α-hydroxyvitamin D3.[46] Japan (Osaka University)
1986 Mycobacterium tuberculosis Mechanism / pathway Rook provides early evidence that vitamin D enhances antimicrobial activity of human monocytes and macrophages against Mycobacterium tuberculosis.[15] United Kingdom
1986 Cancer (melanoma, leukemia) Mechanism / pathway Colston et al. demonstrate that calcitriol inhibits melanoma cell proliferation and induces differentiation of leukemic cells in vitro.[47] United Kingdom
1987 Receptor / gene regulation The complementary DNA encoding the avian vitamin D receptor (VDR) is cloned, revealing structural homology with other steroid hormone receptors and providing the first sequence of a vitamin receptor.[48][2] United States
1988 Receptor / gene regulation The human vitamin D receptor (VDR) is cloned by a research group led by Bert W. O'Malley, enabling detailed study of vitamin D–dependent gene regulation.[2] United States
1989 Kidney disease (hyperparathyroidism) Drug / analog introduction Paricalcitol is patented as a vitamin D analog used to treat secondary hyperparathyroidism in chronic kidney disease.[49][50] United States
1989 Assay / standardization The Vitamin D External Quality Assessment Scheme (DEQAS) is launched to standardize measurement of vitamin D metabolites across laboratories.[51][15] United Kingdom
1989 Cancer (breast cancer, colon cancer) Hypothesis Gorham et al. propose that air pollution reducing UVB exposure may increase cancer risk by impairing cutaneous vitamin D synthesis.[52][7] Canada
1989 Receptor / gene regulation Vitamin D response elements (VDREs) are identified in the human osteocalcin gene, demonstrating direct genomic regulation by vitamin D.[21] United States
1989 Guideline / recommendation The US Recommended Dietary Allowance (RDA) for vitamin D is set at 200 IU, although later evidence suggests higher intake is required for optimal health.[15] United States
1989 Cancer (colon cancer) Clinical evidence (observational) Garland et al. report an inverse association between serum 25(OH)D levels and colon cancer risk.[13] United States
1990 Cancer (prostate cancer) Hypothesis Researchers propose that reduced vitamin D synthesis may contribute to prostate cancer risk, based on epidemiologic patterns related to age, race, and latitude.[15] United States
1990 Psoriasis Drug / analog introduction Calcipotriol is introduced as a topical treatment for psoriasis.[53] Denmark
1992 Vitamin D deficiency Epidemiologic observation A global review highlights regional differences in vitamin D intake and status, with lower levels in Europe and widespread seasonal variation, especially among elderly populations.[54] Ireland
1992 Cancer (prostate cancer) Epidemiologic observation Geographic analyses show that U.S. county-level prostate cancer mortality rates among Caucasian men are inversely correlated with ultraviolet radiation availability, the primary source of vitamin D.[55][56] United States
1993 Psoriasis Drug / analog introduction Tacalcitol ointment is first approved in Japan for the treatment of psoriasis.[53][57] Japan
1994–1999 Muscle function, bone, and fracture risk Clinical evidence (observational) A study in Montreal finds that a substantial proportion of elderly individuals have serum 25(OH)D levels below 20 nmol/L, indicating deficiency likely to impair muscle function and increase fracture risk.[58][15] Canada
1995 Vitamin D deficiency Epidemiologic observation A Dutch-led study of elderly individuals across 11 European countries finds widespread winter vitamin D deficiency, with particularly low levels in Southern Europe.[59] Europe
1997 Rickets, Vitamin D deficiency Mechanism / pathway The enzyme CYP27B1 (1α-hydroxylase), responsible for converting vitamin D to its active form, is cloned from a renal cDNA library, completing molecular characterization of the activation pathway.[60][61] Canada
1997 Vitamin D deficiency Discovery / identification Vitamin D5 is synthesized by researchers at the University of Chicago.[62] United States
1997 Rickets, Vitamin D deficiency Guideline / recommendation The American Academy of Pediatrics and the Canadian Pediatric Association recommend 400 IU/day of vitamin D for children.[15] United States, Canada
1997 Vitamin D deficiency Guideline / recommendation The Dietary Reference Intake panel is established to define nutrient intake standards for North America.[63][13] United States, Canada
1997 Vitamin D toxicity Guideline / recommendation The U.S. Institute of Medicine sets the tolerable upper intake level for vitamin D at 2,000 IU/day.[15] United States
1997 Rickets, Vitamin D deficiency Mechanism / pathway Researchers clone the human 25-Hydroxyvitamin D 1-alpha-hydroxylase, the enzyme crucial for normal bone growth, calcium metabolism, and tissue differentiation.[64] United States
1997 Vitamin D deficiency Epidemiologic observation The Norwegian National Dietary Survey finds vitamin D intake 13% higher in northern than in southern Norway, suggesting no major north–south gradient in serum vitamin D metabolite levels within the country.[15] Norway
1997 Rickets, Vitamin D deficiency Guideline / recommendation The American Academy of Pediatrics (AAP) Committee on Nutrition recommends 400 IU/day of vitamin D as the standard of care for children.[15] United States
1998 Kidney disease (hyperparathyroidism) Drug / analog introduction Paricalcitol (marketed as Zemplar) is introduced by Abbott Laboratories.[65] United States
1998 Cancer (prostate cancer) Mechanism / pathway It is demonstrated that normal human prostate cells possess 25-hydroxyvitamin D3-1α-hydroxylase and can synthesize 1,25(OH)2D from 25(OH)D.[66] United States (University of Miami School of Medicine)
1999 Asthma, allergy Hypothesis Wjst and Dold propose that the introduction of vitamin D in fortified foods and multivitamin preparations in many westernized countries may be related to rising asthma and allergy rates.[8][67] Germany
1999 Literature (scholarly / popularization) Michael F. Holick publishes Vitamin D: Molecular Biology, Physiology, and Clinical Applications.[68] United States
2000 Cancer (prostate cancer) Mechanism / pathway Researchers show that 25(OH)D (calcifediol) inhibits proliferation of prostate cells that possess 1α-hydroxylase.[69] United States (Wake Forest School of Medicine, Winston-Salem, North Carolina)
2001 Kidney disease (secondary hyperparathyroidism) Drug / analog introduction Doxercalciferol (marketed as Hectorol) is introduced in Canada. It is a synthetic vitamin D2 analog used to treat secondary hyperparathyroidism in chronic kidney disease.[70] Canada
2003 Rickets, Vitamin D deficiency Guideline / recommendation In response to the 1997 Institute of Medicine adequate intake recommendations, the Committee on Nutrition of the American Academy of Pediatrics recommends 200 IU/day of vitamin D for all infants and children.[26] United States
2005 Vitamin D deficiency Literature (scholarly / popularization) David Feldman, J. Wesley Pike and Francis H. Glorieux publish Vitamin D, a major reference work covering chemistry, metabolism, mechanisms of action, diagnosis, management, analogs, and emerging therapies.[71] United States
2006 Cancer (digestive-system) Clinical evidence (observational) A Harvard-led prospective study reports that low vitamin D levels may be associated with increased cancer incidence and mortality in men, especially for digestive-system cancers.[72] United States
2007 Cancer (breast cancer) Clinical evidence (observational) Garland et al. publish a dose-response meta-analysis finding that individuals with the highest blood levels of 25-hydroxyvitamin D have reduced risk of breast cancer.[73][7] United States
2007 Anaphylaxis Hypothesis Camargo and colleagues propose that vitamin D status may influence the risk of food-induced anaphylaxis after observing a strong north–south gradient in epinephrine autoinjector prescription rates in the United States.[74] United States (Boston)
2007 Psoriasis Drug / analog introduction CollaGenex Pharmaceuticals licenses becocalcidiol, a vitamin D analogue for topical treatment of psoriasis and related psoriatic disorders.[75][76] United States
2008 Skin cancer Literature (scholarly / popularization) Jörg Reichrath publishes Sunlight, Vitamin D and Skin Cancer, an overview of the positive and negative effects of ultraviolet exposure, with particular focus on vitamin D and skin cancer.[77] Germany
2008 Guideline / recommendation The American Academy of Pediatrics increases the recommended vitamin D supplementation dose from 200 to 400 IU daily across the pediatric age spectrum.[78] United States
2008 Literature (scholarly / popularization) James Dowd and Diane Stafford publish The Vitamin D Cure, which argues that many chronic health problems are linked to widespread vitamin D deficiency and promotes correction through supplementation, sunlight exposure, diet, and lifestyle changes.[79] United States
2009 Literature (scholarly / popularization) Soram Khalsa publishes Vitamin D Revolution, which argues that vitamin D deficiency is widespread and linked to diseases beyond rickets, and advocates monitoring and supplementation to improve health outcomes.[80] United States
2010 Pneumonia Clinical trial (RCT) A randomized clinical trial finds that vitamin D supplementation reduces the risk of pneumonia in children.[13]
2010 Rheumatoid arthritis Clinical evidence (observational) A study in Italy finds an inverse association between rheumatoid arthritis activity and disability scores and calcifediol concentrations.[13] Italy
2011 (January) Osteoporosis Drug / analog introduction Eldecalcitol is approved in Japan for the treatment of osteoporosis.[81] It is a structural analog of vitamin D.[82] Japan
2012 Literature (scholarly / popularization) Ian Wishart publishes Vitamin D: Is This the Miracle Vitamin?, arguing that vitamin D supplementation may significantly reduce cancer risk and improve overall health outcomes.[83] New Zealand
2016 Literature (scholarly / popularization) Ana Claudia Domene publishes Multiple Sclerosis and (lots Of) Vitamin D, introducing the Coimbra Protocol, a therapeutic approach based on high-dose vitamin D for autoimmune diseases.[84] Brazil
2018 Cancer (colorectal cancer) Clinical evidence (observational) An international study finds that higher blood levels of vitamin D are associated with lower risk of colorectal cancer.[85] United States
2018 Literature (scholarly / popularization) Emilia Pauline Liao publishes Extraskeletal Effects of Vitamin D: A Clinical Guide, examining associations between vitamin D deficiency and a range of non-skeletal diseases.[86] United States
2020 (July) COVID-19 Literature (scholarly / popularization) David C. Anderson and David S. Grimes publish Vitamin D Deficiency and Covid-19: Its Central Role in a World Pandemic, arguing that adequate vitamin D levels may play a role in immune response to viral infections.[87] United States
2021 (January 14) Common cold, influenza, influenza-like illness Clinical trial (RCT) A randomized controlled trial led by QIMR Berghofer Medical Research Institute finds that vitamin D supplementation does not significantly reduce the incidence of colds, influenza, or other acute respiratory infections in most individuals.[88] Australia
2023 (January 17) Cancer, autoimmune disease Clinical evidence (observational) Analysis of VITAL trial data finds that the health effects of vitamin D supplementation vary by body mass index (BMI), with benefits such as reduced cancer mortality and autoimmune disease primarily observed in individuals with BMI under 25, and attenuated biological responses in individuals with higher BMI.[89] United States
2023 (September) Cancer (colorectal cancer, lung cancer, prostate cancer) Clinical evidence (observational) A UK Biobank study of over 411,000 participants reports that vitamin D deficiency is associated with increased mortality from several cancers, including colorectal, lung, and prostate cancer, while supplementation is associated with lower lung cancer and overall cancer mortality.[90] United Kingdom
2023 (October 2) Inflammatory bowel disease Clinical evidence (systematic review / meta-analysis) A Cochrane review of 22 randomized trials finds low-certainty evidence that vitamin D may reduce relapse rates in inflammatory bowel disease, with unclear effects on symptoms, quality of life, and safety.[91] United Kingdom
2023 (October 26) Periodontal disease Clinical evidence (systematic review / meta-analysis) A systematic review reports an association between vitamin D status and periodontal health, potentially mediated by antimicrobial and anti-inflammatory effects, though evidence remains limited and heterogeneous.[92] United States
2023 (November 12) Vitamin D deficiency Clinical evidence (observational) Studies from Intermountain Health suggest that standard vitamin D dosing recommendations may be insufficient to achieve target serum levels in many individuals, with substantial interindividual variability in dose requirements.[93] United States
2023 (December 1) Fracture, Bone density Clinical trial (RCT) A large randomized controlled trial in Mongolian schoolchildren finds that vitamin D supplementation increases serum levels but does not reduce fracture risk or improve bone strength over three years.[94][95] Mongolia, United Kingdom
2024 (March) Obesity, Vitamin D deficiency Mechanism / pathway A study examining vitamin D metabolism in obesity finds a high prevalence of deficiency and reduced response to supplementation, with evidence suggesting sequestration in adipose tissue, dilution effects, and altered metabolism.[96] United Arab Emirates
2024 (April 4) Aging, Stem cell biology Mechanism / pathway (experimental model) Experimental research in Drosophila identifies a role for the vitamin D receptor (VDR) pathway in maintaining intestinal stem cell function and limiting age-related cellular dysfunction.[97] Singapore
2024 (May 7) Vitamin D deficiency Review / theoretical synthesis Carsten Carlberg publishes an article outlining the evolutionary history of vitamin D, proposing that its biological roles shifted from cellular regulation in early eukaryotes to calcium homeostasis in terrestrial vertebrates, with modern deficiency arising from lifestyle and reduced UV exposure.[98] Finland
2024 (June 3) Vitamin D deficiency Guideline / recommendation The Endocrine Society issues a clinical practice guideline stating that healthy adults under 75 are unlikely to benefit from vitamin D intake above recommended levels and do not require routine vitamin D testing, while identifying specific subgroups that may benefit from supplementation.[99] United States
2024 (July 16) Cancer, Immune system, Metabolic disease Mechanism / pathway (review) A review examines interactions between vitamin D and arsenic, reporting potential combined effects on immune function, cancer biology, and metabolic disease, while emphasizing the need for further targeted research.[100]
2024 (September 20) Multiple sclerosis Clinical trial (RCT) Preliminary results presented at ECTRIMS 2024 report that high-dose oral vitamin D3 (100,000 IU every 2 weeks) reduces disease activity in adults with clinically isolated syndrome (CIS), with lower disease activity than placebo and longer time to disease activity, while secondary outcomes such as relapse rate and disability progression remain unchanged.[101] France
2024 (October 24) Obesity, Vitamin D deficiency, Bone development Clinical evidence (observational) A study of school-aged children reports that vitamin D deficiency is associated with higher body mass index, adverse metabolic markers, lower calcium levels, and delayed bone maturation, supporting an association between vitamin D insufficiency, childhood obesity, and impaired skeletal development.[102] China
2024 (November 18) Hypertension, Obesity Clinical trial (RCT) A post hoc analysis of a randomized controlled trial reports that vitamin D and calcium supplementation may modestly reduce blood pressure in older adults with overweight, with stronger effects in participants with obesity or hypertension and no clear advantage of high-dose over standard-dose vitamin D.[103] United States
2024 (November 20) Immune system, Autoimmune disease Mechanism / pathway A study reports that vitamin D3 and IL-10 condition regulatory dendritic cells through a distinct epigenetic program linked to immune suppression, helping clarify mechanisms of vitamin D–mediated immune regulation.[104] United States
2024 (December) Vitamin D deficiency Regulatory approval / product launch Nutriearth’s N-utra, a vitamin D3-enriched mealworm ingredient, receives EU Novel Food authorization.[105] European Union
2025 (May 13) Liver disease, Fibrosis Mechanism / pathway A study in chronic liver disease reports that vitamin D signaling limits ductular reaction, inflammation, and fibrosis through a TXNIP-linked pathway, identifying a potential mechanism for protection against liver disease progression.[106] South Korea
2025 (June 6) Non-communicable disease Review / theoretical synthesis A review surveys recent advances in vitamin D research, including its roles in metabolism, immunity, and non-communicable disease, while noting ongoing uncertainty about optimal thresholds and causality.[107] India
2025 (July 4) Diabetic macular edema, Diabetic retinopathy Clinical evidence (observational) A cross-sectional study of adults with diabetic macular edema reports that lower vitamin D levels are associated with retinal microvascular damage on OCTA imaging.[108] Egypt
2025 (July 11) Parkinson's disease, Autoimmune disease Clinical trial (RCT) A randomized placebo-controlled study in patients with Parkinson’s disease and vitamin D deficiency reports that vitamin D3 supplementation modifies Th17/Treg balance and is associated with improved motor scores, though the authors describe the findings as preliminary.[109] China
2025 (December 4) Tooth decay Clinical evidence (observational) A cohort study reports that lower maternal vitamin D levels during pregnancy are associated with higher odds of early childhood caries in offspring up to age 5.[110] China

Numerical and visual data

Google Scholar

The following table summarizes per-year mentions on Google Scholar as of September 19, 2021.

Year "vitamin D"
1920 16
1930 502
1940 723
1950 932
1960 950
1970 1,780
1980 3,350
1990 4,350
2000 9,600
2010 30,000
2020 45,300

The chart below shows Google Trends data for Vitamin D, from January 2004 to September 2021, when the screenshot was taken. Interest is also ranked by country and displayed on world map.[111]

Google Ngram Viewer

The comparative chart below shows Google Ngram Viewer data for vitamin D, vitamin A, vitamin B and vitamin C, from 1900 to 2019.[112]

Wikipedia Views

The chart below shows pageviews of the English Wikipedia article Vitamin D, from July 2015 to August 2021.[113]

Other

Trend of “Vitamin d deficiency” reports.[114]

Meta information on the timeline

How the timeline was built

The initial version of the timeline was written by User:Sebastian.

Funding information for this timeline is available.

Feedback and comments

Feedback for the timeline can be provided at the following places:

  • FIXME

What the timeline is still missing

Timeline update strategy

See also

References

  1. ↑ Milne, G. W. A.; Delander, M. (2008). Vitamin D Handbook: Structures, Synonyms, and Properties. John Wiley & Sons. ISBN 978-0-470-13983-7. Retrieved 31 August 2021.
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Hochberg, Z. (2003). Vitamin D and Rickets. Karger. ISBN 978-3-8055-7582-9.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Wolf, George (1 October 2004). "The Discovery of Vitamin D: The Contribution of Adolf Windaus". The Journal of Nutrition. 134 (6): 1299–1302. doi:10.1093/jn/134.6.1299.
  4. ↑ "Cod Liver Oil - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 11 August 2021.
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  6. ↑ 6.0 6.1 Hochberg, Ze'ev; Hochberg, Irit (15 May 2019). "Evolutionary Perspective in Rickets and Vitamin D". Frontiers in Endocrinology. 10. doi:10.3389/fendo.2019.00306. ISSN 1664-2392.{{cite journal}}: CS1 maint: unflagged free DOI (link)
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  103. ↑ "Vitamin D May Lower Blood Pressure in Seniors With Overweight". Medscape. 18 November 2024. Retrieved 5 December 2025.
  104. ↑ "Epigenetic signature of human vitamin D3 and IL-10 conditioned regulatory DCs". Scientific Reports. 14. Nature Portfolio. 20 November 2024. doi:10.1038/s41598-024-79299-x. Retrieved 5 December 2025. {{cite journal}}: |article= ignored (help); Unknown parameter |authors= ignored (help)
  105. ↑ Benjamin Ferrer (5 December 2024). "N-utra functional vitamin D3-enriched mealworm flour obtains EU Novel Food status". FoodIngredientsFirst. Retrieved 5 December 2025.
  106. ↑ "Vitamin D supplementation ameliorates ductular reaction, liver inflammation and fibrosis in mice by upregulating TXNIP in ductular cells". Nature Communications. 16. Nature Portfolio. 13 May 2025. Retrieved 5 December 2025. {{cite journal}}: |article= ignored (help); Unknown parameter |authors= ignored (help)
  107. ↑ Deepika (2025). "Vitamin D: recent advances, associated factors, and its role in combating non-communicable diseases". npj Science of Food. 9: 100. doi:10.1038/s41538-025-00460-5. Retrieved 2025-12-04. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  108. ↑ "Relation between vitamin D deficiency and diabetic maculopathy". Scientific Reports. Nature. 4 July 2025. Retrieved 4 December 2025. {{cite web}}: Unknown parameter |authors= ignored (help)
  109. ↑ "Impact of vitamin D3 supplementation on motor functionality and the immune response in Parkinson's disease patients with vitamin D deficiency". Scientific Reports. 15. Nature Portfolio. 11 July 2025. Retrieved 4 December 2025. {{cite journal}}: |article= ignored (help); Unknown parameter |authors= ignored (help)
  110. ↑ "Vitamin D Levels During Pregnancy and Dental Caries in Offspring Up to Age 5 Years". JAMA Network Open. 2025. Retrieved 5 December 2025.
  111. ↑ "Vitamin D". Google Trends. Retrieved 19 September 2021.
  112. ↑ "vitamin D, vitamin A, vitamin B and vitamin C". books.google.com. Retrieved 19 September 2021.
  113. ↑ "Vitamin D". wikipediaviews.org. Retrieved 19 September 2021.
  114. ↑ "Vitamin d deficiency: treatments, associated drugs and conditions (21,591 reports) - eHealthMe". www.ehealthme.com. Retrieved 13 September 2021.
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