Article: The relative vitamin A value of 9-cis (Beta)-carotene is less and that of 13-cis (Beta)-carotene may be greater than the accepted 50% that of all-trans (Beta)-carotene in gerbils

Nutrient Metabolism-Research Communication

The Relative Vitamin A Value of 9-- cis beta-Carotene Is Less and That of 13-cis beta-Carotene May Be Greater than the Accepted 50% That of All-- trans beta-Carotene in Gerbils1

ABSTRACT The effectiveness of beta-carotene ((beta)C) as a vitamin A (VA) precursor may be influenced by the proportions of cis isomers of (beta)C consumed in the diet. Although the metabolic fates of cis isomers of (beta)C are poorly understood, their retinol equivalency has been assigned a value 50% that of all-trans (at) (beta)C. A dose-response design was used to estimate the relative VA value (VAV) of at(beta)C, 9-cis (9c) (beta)C and 13-cis (13c) (beta)C in gerbils ...

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