There is conflicting evidence in the April 2014 British Medical Journal, where two papers found that Vitamin D supplementation did not increase bone mineral density in those who have osteopenia or osteoporosis, nor did it decrease bone fracture risk.
Additionally, both articles point out that research does not demonstrate “a clear role for vitamin-D supplementation for any other indication remains to be established.” (McCall, 2014)
Both research articles were reviews of research already done. They were not new studies examining the effects of vitamin D.
The type of vitamin D used in the research articles was important as there are two types: D2 (ergocalciferol) and D3 (cholecalciferol). The D3 reduced all-cause mortality risk by 11 percent whereas the D2 did not have any effect on mortality.
Some studies pooled choose to use D2 while others used D3. This is important to consider when reading the back of your vitamin label.
Additionally, it is helpful to understand what is truly considered low vitamin D. Depending on the lab or research, numbers vary, however on average if a person is below 30 nmol/L they are considered low. Numbers above 100 nmol/L are considered too high and potentially toxic.
In looking at a person’s geographical location and sun exposure, they may be deficient most of the year.
It is also critical to realize that some studies used vitamin D supplementation at less than or equal to 800 IUs. Some experts believe that proper supplementation and fracture risk reduction should be much higher.
There is even an FDA approved vitamin D medication that is 50,000 IUs per pill. Providers will prescribe it for 4-12 weeks at a time in order to properly supplement a deficient person. Therefore dose counts.
Vitamin D has been indicated as helpful in the role of cardiovascular, skeletal, endocrine, immune, autoimmune, mental disorders and more. Anecdotally, many people report that supplementing with vitamin D has improved a variety of symptoms from muscle aches and pains to mood.