a structure that must be metabolized Vibe The Most Powerful Liquid Ionic Multi-Mineral Multi-Vitamin chokeberry grape and tomato
a substance that can be converted into a vitamin by animal tissues
a substance that turns into a vitamin via a natural reaction in the body)
a vitamin precursor; a chemical substance necessary to produce a vitamin.
Any compound capable of being converted into a vitamin by the body.
A substance found in certain foods, that the body may convert into a vitamin. Also called previtamin.