Vitamin D is a popular yet arguably controversial supplement. One reason for the controversy is that people are concerned about suffering from toxicities if they take over the commonly recommended amount.
Some of this concern is merited: vitamin D is fat-soluble, meaning that compared to water-soluble vitamins such as B-group vitamins and vitamin C, it is stored in the body for a much longer time, which can put people at a higher risk of toxicity.
On the other hand, as vitamin D deficiency has been deemed an epidemic, more people consider supplementing with it. Therefore, compared to other fat-soluble vitamins like vitamins A, K, and E, it will naturally be subject to a higher level of scrutiny….