Good dietary sources of biotin include brewer's yeast, nutritional
yeast, liver, cauliflower, salmon
, bananas, carrots, egg yolks, sardines, legumes and mushrooms.
Biotin deficiency isn't common, unless you frequently eat a lot of raw egg white, which contains a protein that blocks the absorption of biotin. Genetic disorder of biotin deficiency, infant seborrheic dermatitis, surgical removal of the stomach, and excessive alcohol consumption may increase a person's requirement for biotin.