Posted by: Kevin G. Parker, D.C.
Vit. D Potency Varies widely from label claims-JAMA Internal Medicine Feb 2013:
Erin LeBlanc from Oregon Health & Science University and colleagues reported that Vit. D supplement brands varied widely from label claims. 12 manufacturers were checked and contents ranged from 52 to 135% of expected dose.
Points from me…A good source of vitamin D may be hard to find.
Our bodies manufacture vitamin D3 when skin is exposed to the sun s ultraviolet-B rays which can be blocked by both windows and sunscreen.
And vitamin D is found naturally only in a few foods (e.g., fish, eggs).
That’s why products like milk are vitamin D-fortified.
Dietary supplements are often recommended, but vary in quality and may not include D3, which may be 3 times more potent than D2.
The supplement form (e.g., liquid, tablet) and manufacturing may also influence absorption potential.
That’s why it s just as important with this “basic” vitamin to seek higher quality for maximum benefits.
Related articles:
Vit D deficiency in Athletes–Amer J of Sports Medicine 2013
Vit D-Low levels of D cause problems in patients with autoimmune disorders
Vit D and Lupus-SLE-Rheumatology 2012
Vit D for Higher Levels of Health 2012
Vit D for Cancer Prevention-Annals of Epidemiology 2009
Vit D- Reduction in breast cancer risk-Cancer Causes Ctrl 2010
Vit D2 versus D3-Meta Analysis-John J. Cannell, M.D.
Vit D3 and the Flu-Epidemiology and Infection-2007
Vit. D- The Food and Nutrition Board has failed millions
Vit. D-What We Have Learned About Vitamin D Dosing
Vitamin D Supplementation: An Update-U.S. Pharmacist 11/11/2010
Vitamin D3 Helps Clear Amyloid in Alzheimer’s Disease
Vit. D3-promote fat loss and gain good muscle in women
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