La biotina (del grèc bios : vida), vitamina H, vitamina B7 o la vitamina B8; es una vitamina e un coenzim, establa a la calor, solubla dins l'aiga e l'alcòl e sensibla a l'oxidacion, qu'interven dins lo metabolisme dels glucids, lipids, aminoacids e purinas.
Es essenciala per la sintèsi e degradacion de graissas e la degradacion de cèrts aminoacids.
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