Group annotations on this page
nightsurfer on 2009-12-03"Cholecalciferol is a form of Vitamin D, also called vitamin D3 or calciol.
It is structurally similar to steroids such as testosterone, cholesterol, and cortisol (though vitamin D3 itself is a secosteroid).
One gram of pure vitamin D3 is 40 000 000 (40x106) IU, or, in other words, one IU is 0.025 μg. Individuals having a high risk of deficiency should consume 125 μg (5000 IU) of vitamin D daily"