Sources of Vitamin B7...

Biotin is found in many foods, but generally in lower amounts than other water-soluble vitamins.

Egg yolk, barley, liver, and yeast are rich sources of biotin.

Large national nutritional surveys in the U.S. were unable to estimate biotin intake due to the scarcity of data on the biotin content of food. Smaller studies estimate average daily intakes of biotin to be from 40 to 60 mcg/day in adults.