Dr. Michael F. Holick, Ph.D., M.D.
Dr. Michael F. Holick

Welcome to VitaminDHealth.org

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 Michael F. Holick, PhD, MD
 Professor of Medicine, Physiology and Biophysics
 Director of the General Clinical Research Center
 Director of the Vitamin D, Skin and Bone Research Laboratory
 Director, Biologic Effects of Light Research Center
 Boston University Medical Center

               Help spread the word about Vitamin D deficiency in 2013:

Dr. Holick’s new book The Vitamin D Solution is now available! Click on the book cover for more information on how to order.

Vitamin D is not a vitamin but a hormone. It is unique in that it is made in the skin as a result of exposure to sunlight. Photosynthesis of vitamin D has been occurring on earth for more than 750 million years. Some of the earliest life forms that were exposed to sunlight for their energy requirement were also photosynthesizing vitamin D. Both children and adults have in the past depended on adequate sun exposure to satisfy their vitamin D requirement. It is well documented that at the turn of the last century upwards of 80% of children in the industrialized, polluted cities of northern Europe and northeastern United States suffered from the devastating consequences of vitamin D deficiency rickets. The skin has a large capacity to make vitamin D. Exposure of a person in a bathing suit to a minimal erythemal dose of sunlight, which is typically no more than 15-20 minutes on Cape Cod in June or July at noon time, is the equivalent to taking 20,000 IU of vitamin D orally. It is now well documented that in the absence of any sun exposure 1,000 IU of vitamin D3 a day is necessary to maintain healthy levels of 25-hydroxyvitamin D in the circulation. An analysis of the NHANES III data has demonstrated that neither children nor adults are receiving an adequate amount of vitamin D from their diet or from supplements.

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’The D-Lightful Vitamin D for Good Health‘, from I.H.M.C. lecture, published March 16, 2013

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View the latest video clip of Dr. Holick speaking about  …’The D-Lightful Vitamin D for Good Health‘, from I.H.M.C. lecture, published March 16, 2013 – click here to view the video clip:   http://www.youtube.com/watch?v=hiGBVDcbFVk&feature=youtu.be

“Influence of Vitamin D Status and Vitamin D3 Supplementation on Genome Wide Expression of White Blood Cells: A Randomized Double-Blind Clinical Trial”

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Influence of Vitamin D Status and Vitamin D3 Supplementation on Genome Wide Expression of White Blood Cells:  A Randomized Double-Blind Clinical Trial” was recently published in PLOS ONE and is available online by clicking here to view:  http://dx.plos.org/10.1371/journal.pone.0058725

Dr. Holick’s Responses to Participant Questions During the December 5, 2008 Live Webinar Presentation “Vitamin D & Chronic Disease Risk”

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I have heard that vitamin D may play a role in epilepsy, possibly due to interaction with anti-epileptic drugs.  Is this becoming an acknowledged effect?  And how much vitamin D is necessary to combat the interaction to reduce seizures?

Response:  Epileptic drugs will enhance the destruction of vitamin D making patients who are on anti-seizure medications at higher risk for developing vitamin D deficiency and osteomalacia or rickets.  Measurement of 25-hydroxyvitamin D [25(OH)D] is important in patients on antiepileptic medications.  Often twice as much vitamin D is required to maintain a blood level of  25(OH)D of > 30 ng/ml.  Thus, 2,000-4,000 IU of vitamin D/d is usually needed.  An alternative is to take 50,000 IU of vitamin D2 either once every week or once every two weeks depending on the serum 25-hydroxyvitamin D level.




What is your position on vitamin D and depression and schizophrenia?

Response:  There is evidence that vitamin D deficiency during pregnancy increases the risk of the child developing schizophrenia during their adult life.  There is also evidence that vitamin D receptors exist in the brain, and that the active form of vitamin D, 1,25-dihydroxyvitamin D, Read more of this article »

Multiple Sclerosis and Vitamin D

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It is known that if you are born above 35° latitude at approximately Atlanta, Georgia, and live at this latitude for the first ten years of your life that you have a 100% increase risk of developing multiple sclerosis.  Recent studies have suggested that women and men who increase their vitamin D intake above 400 IU of vitamin D a day reduces risk of developing multiple sclerosis by approximately 40%.  


Munger KL, Zhang SM, O’Reilly E, Hernan MA, Olek MJ, Willett WC, Ascherio A.  Vitamin D intake and incidence of multiple sclerosis.  Neurology  2004; 62(1):60-5.

Munger KL, Levin LI, Hollis, BW, Howard NS, Ascheino A.  Serum 25-hydroxyvitamin D levels and risk of multiple sclerosis.  JAMA 2006; 296:2832-2838.

Ponsonby A-L, McMichael A, and van der Mei I.  Ultraviolet radiation and autoimmune disease: insights from epidemiological research. Toxocology 2002;181-182:71-78.

Infectious Diseases and Vitamin D

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It has long been recognized that patients with tuberculous do better when treated with vitamin D or exposed to sunlight.  It was recently recognized that the immune cell known as the macrophage needs vitamin D in order to produce a peptide which is responsible for killing infectious agents such as tuberculous.  It has been speculated that one of the reasons that influenza occurs in the winter time in tepid climates is because the sun is unable to produce vitamin D, and the resulting vitamin D insufficiency may promote and enhance the infectivity of the influenza virus.  

Adams,J.S., Gacad,M.A., Anders,A., Endres,D.B., and Sharma,O.P. 1986. Biochemical indicators of disordered vitamin D and calcium homeostasis in sarcoidosis. Sarcoidosis 3:1-6.

Gallo, R.L., Eisenberg, D., Hewison, M., Hollis, B.W., Adams, J.S., Bloom, B.R., Modlin, R.L.  2006.  Toll-like receptor Triggering of a vitamin D-mediated human antimicrobial response.  Sciencexpress.  3:1770-1773.  
Liu, P.T., Stenger, S., Li, H., Wenzel, L., Tan, B.H., Krutzik, S., Ochoa, M.T., Schauber, J., Wu, K., Meinken, C., Kamen, D.L., Wagner, M., Bals, R., Steinmeyer, A., Zugel, U.

Arthritis and Vitamin D

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Rheumatoid Arthritis and Osteoarthritis

Recent studies have revealed that women who ingest more than 400 IU of vitamin D a day reduce their risk of developing rheumatoid arthritis by as much as 42%.

Vitamin D deficiency has been associated with an increased risk of developing osteoarthritis.  

Merlino LA, Curtis J, Mikuls TR, Cerhan JR, Criswell LA, and Saag KG.  Vitamin D intake is inversely associated with rheumatoid arthritis.  Arthritis & Rheumatism  2004; 50(1):72-77.

Diabetes and Vitamin D

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Diabetes mellitus type I

Studies in mice have suggested that pretreating mice that are prone to developing type I diabetes with the active form of vitamin D (1,25-hydroxyvitamin D [1,25(OH)2D]) reduces the development of type I diabetes by 80%.  This study is supported by the observation in Finland where children in the 1960’s routinely received 2,000 IU of vitamin D a day during their first year of life.  When these children were followed for the next 31 years, it was observed that these children had a reduced risk of developing type I diabetes by 78%.  Children who were vitamin D deficient at the same time and also followed for 31 years had an almost 300% increased risk of developing type I diabetes.  


Hypponen E, Laara E, Jarvelin M-R, Virtanen SM.  Intake of vitamin D and risk of type 1 diabetes: a birth-cohort study.  Lancet 2001;358:1500-1503.

Diabetes mellitus type II

The beta islet cells that produce insulin in the pancreas have a vitamin D receptor.  The active form of vitamin D stimulates the pancreas to produce insulin.  It has been observed that the relative risk of developing type II diabetes is reduced by as much as 33% in men and women who increase their intake of vitamin D above 800 IU/day along with 1,000 milligrams of calcium.  


Pittas AG, Dawson-Hughes B, Li T, et al.  Vitamin D and calcium intake in relation to type 2 diabetes in women.  Diabetes Care 2006:29:650-56.

Rickets and Vitamin D

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Rickets occurs at approximately six months of age in children who are vitamin D deficient.  They can present with growth retardation, skeletal deformities including bowing of the legs or knocked knees, prominent knob like projections along the ribs next to the sternum known as the rachitic rosary and muscle weakness.  Infants with vitamin D deficiency also suffer from craniotabes which is a softening of the skull causing it to become square shaped.  They can have increase in the bone formation in the front of the head which is known as frontal bossing.


Holick, M.F.  Resurrection of vitamin D deficiency and rickets.  J Clin Invest 2006, 116(8):2062-2072..

Kreiter SR, Schwartz RP, Kirkman HN, Charlton PA, Calikoglu AS, Davenport M.  Nutritional rickets in African American breast-fed infants.  J Pediatr 2000;137:2-6.

Marksted, T., Halvorsen, S., Halvorsen, K.S., Aksnes, L., and Aarskog, D.  1984. Plasma concentrations of vitamin D metabolites before and during treatment of vitamin D deficiency rickets in children.  Acta Padiatr Scand. 73:225-231.

Osteomalacia and Vitamin D

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Vitamin D deficiency causes a defect in the ability of the body to deposit calcium into the collagen jello-like matrix in the bone.  As a result, the covering on the bone which contains pain sensing nerves is easily deformed resulting in throbbing aching bone pain.  Patients with osteomalacia often complain of achiness in their muscles and bones.  These non-specific aches and pains in the bones and muscles are often misdiagnoses as fibromyalgia or chronic fatigue syndrome.  There have been several studies demonstrating that patients with severe bone and muscle pain and muscle weakness associated with osteomalacia have dramatic improvement in their symptoms when vitamin D deficiency is corrected.  It takes months to years to develop osteomalacia and associated symptoms and it takes three to six months before significant improvement in symptoms results from correcting vitamin D deficiency.  


Holick, M.F.  Vitamin D deficiency:  What a Pain it is.  Mayo Clin. Proc.  2003; 78(12): 1457-1459.

Malabanan AO, Turner AK, Holick MF. Severe generalized bone pain and osteoporosis in a premenopausal black female: effect of vitamin D replacement. J Clin Densitometr . 1998;1:201-204.

Osteoporosis and Vitamin D

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Vitamin D deficiency will cause removal of both the calcium and matrix from the bone, and as a result, will cause osteopenia and can precipitate and exacerbate osteoporosis.  Unlike osteomalacia which causes bone pain, osteoporosis, which is porotic bone, i.e., holes in the bones and loss of bone does not cause bone pain unless there is an acute fracture.  Typically this pain resolves as the fracture heals and can be easily distinguished from osteomalacia.  


Bischoff-Ferrari, HA, Giovannucci, E., Willett, W.C., Dietrich, T., and Dawson-Hughes, B.  Estimation of optimal serum concentrations of 25-hydroxyvitamin D for multiple health outcomes.  Am J Clin Nutr  2006; 84:18-28.  

Boonen S, Bischoff-Ferrari A, Cooper C, Lips P, Ljunggren O, Meunier PJ, Reginster JY.  Addressing the musculoskeletal components of fracture risk with calcium and vitamin D:  a review of the evidence.  Calcif Tissue Int  2006; 78(5):257-70.

Chapuy MC, Arlot ME, Duboeuf F, Brun J, Crouzet B, Arnaud S, Delmas PD, Meunier PJ.  Vitamin D3 and calcium to prevent hip fractures in elderly women.  N Engl J Med 1992; 327(23):1637-1642.