title: Relative value of carotenoids as precursors of vitamin A.
mesh_terms: D000042:Absorption; D000818:Animals; D002338:Carotenoids / Q000031:analogs & derivatives / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology; D055598:Chemical Phenomena; D002621:Chemistry; D004355:Drug Stability; D005504:Food Analysis; D006801:Humans; D013237:Stereoisomerism; D014801:Vitamin A / Q000096:biosynthesis*; D014802:Vitamin A Deficiency / Q000517:prevention & control; D019207:beta Carotene
chemical_list: D019207:beta Carotene; D014801:Vitamin A; D002338:Carotenoids; C004984:apocarotenal