Also found in: Wikipedia.
biotin deficiencyA rare constellation of clinical findings due to a lack of biotin, which is characterised by anaemia, dry skin, enteritis and hypercholesterolemia. Biotin deficiency is rare, as biotin is formed by intestinal flora; it occurs in those who consume raw eggs. It is a coenzyme in carboxylation reactions.
Egg yolks, milk, tomatoes, yeast.
Excess consumption of raw egg whites, which are rich in avidin, an egg-white protein that chelates biotin.