pseudovitamin

pseudovitamin
A substance having a chemical structure very similar to that of a given vitamin, but lacking the usual physiologic action.
- p. B12 cobamide cyanide phosphate, 3′-ester with 7-α-d-ribofuranosyladenine, inner salt; vitamin B12 with adenine replacing dimethylbenzimidazole; one of several substances produced during anaerobic fermentation by certain organisms in bovine rumen contents; it is chemically closely similar to vitamin B12 (cyanocobalamin) but without, in humans, the physiologic action of the vitamin.

Medical dictionary. 2011.

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