Provitamin(redirected from provitamin D3)
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Related to provitamin D3: provitamin D2
A vitamin precursor; assumes vitamin activity upon activation or chemical change.
a biochemical precursor of a vitamin. Provitamin A (carotene), which is synthesized by plant cells, forms the A vitamins in animal cells. Ergosterol and its derivatives form the calciferols, the D vitamins.