Vitamin D was classified by scientists as any substance that possessed an anti-rickets property almost 100 years ago. As this was first stated in the 20th century, we have since learned that vitamin D has many functions in the body. For the most part, vitamin D is associated with deficiency states and is not viewed as a true ergogenic substance.

Vitamin D occurs in many different forms within the body. Its active form is 1,25(OH)2D3, otherwise known as calcitriol. Calcitriol is a steroid hormone, thus vitamin D can be considered a prohormone.1-3 Calcitriol is a hormone that is released by the kidney and taken up by other organs throughout the body. It acts upon the heart, brain, stomach, intestines, bones and within the kidneys.

Calcitriol is transported throughout the body in the blood via an alpha-2-globulin, known as a vitamin D-binding protein.

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