New research also shows that the amount of vitamin D required for a person is based on their body size, it’s not one-size-fits-all. More body weight means you need more vitamin D.
Age Range 9-70
Current (At risk)
Recommended Daily Allowance (RDA)- 600-800 IU/d
Upper Level (UL)-4,000 IU/d
Recommended Daily Allowance (RDA) -6,000 – 9,000* IU/d
Upper Level (UL) -20,000 IU/d
*BMI-dependent, Ranges: Normal 18.5-25, Overweight 25-30, Obese: >30
Overweight and obese need 2-3 times more vitamin D to achieve the same level as normal weight
Vitamin D plays an important role in overall health. Vitamin D is used by nearly every cell in the body and has an effect on every system. Since it acts as a protector and regulator, it enhances the functioning of our body’s systems to protect against disease. Simply put, optimizing vitamin D levels results in better health.
Other studies have also found that if Canadians optimized their intake of Vitamin D an estimated 37,000 premature deaths could be avoided annually and we could reduce the burden of chronic disease by $14.4 billion per year! Over the last 5 years the total lost savings is upwards of $72 billion.
We believe that it is imperative the Health Canada guidelines be revised and that Canada’s current approach to health change from treating disease to optimizing health. Join us in our request.
Source: Written by Allan Markin - http://www.purenorth.ca
 Veugelers PJ, Ekwaru JP. 2014. A statistical error in the estimation of the Recommended Daily Allowance for vitamin D. Nutrients 20;6(10):4472-5.
 Ekwaru JP, Zwicker JD, Holick MF, Giovannucci E, Veugelers PJ. 2014. The importance of body weight for the dose response relationship of oral vitamin D supplementation and serum 25-hydroxyvitamin D in healthy volunteers. PLOS One 5;9(11):e111265.
 Grant WB, Schwalfenberg GK, Genuis SJ, Whiting SJ. 2010. An estimate of the economic burden and premature deaths due to vitamin D deficiency in Canada. Mol Nutr Food Res 54(8):1172-81.