molecular model of beta-carotene, precursor to vitamin a, 3d

betacarotene carotene essential molecule scientific prescription biochemistry pigment molecular element prevention physiology complex essence carotenoid bioactive human health chemical compound extract metabolite medication antioxidant important 3d illustration medical wellness chemistry care research healthy science pharmacy model vitamin a medicine carrot roots precursor pumpkin rhodotorula yeasts isolated black background balls and sticks carotenemia