Your supplement may not have the effect you think it will.
When it comes to vitamin supplementation, new research finds that, especially for people of white European descent, taking vitamin D3 may help your body fight off viruses and bacteria, while vitamin D2 could play an actively harmful role.
"Taking vitamin D2 supplements may not be beneficial to your health. In fact, they may be harmful by counteracting the roles of vitamin D3," the study's lead author, Professor of Functional Genomics at the University of Surrey, told Eat This, Not That! in an interview."[My advice is to] take a vitamin D3 supplement. You are not going to get enough from your diet, or from the sun between October and March if you live in northern Europe or other northern [areas].