The Effect of Vitamin D Supplementation on Muscle Power in Elite Cyclist

The vitamin D supplementation will consist of a capsule of 100 mcg of vitamin D/d, to be taken throughout the day. Participants will achieve 100 mcg by taking 2 x 25 mcg capsules per day. One will be taken at each time point (i.e., morning and evening) throughout the day. They will take the vitamin D supplement for the 6 month intervention period

Participants in the placebo group will receive a capsule containing the inactive ingredients that include cellulose and silica to create a gel-like substance