Biotin's Role in Health
Although biotin is included in multivitamins, most people don’t need supplementation in order to meet their biotin needs. The daily adequate intake (AI) for biotin for adults over 19 years old is 30 µg,1 as established by the Food and Nutrition Board. The AI for pregnant women is 35 µg.1
Over-the-counter biotin supplements contain as much as 10,000 µg, greater than 300 times the daily recommended intake. Biotin is sold under various names: vitamin H, coenzyme R or vitamin B7. Pharmacokinetic studies have shown that serum concentrations of biotin can reach up to 300 ng/mL when taking supplements containing 20 mg biotin2 or 1,160 ng/mL for patients taking doses of biotin up to 300 mg.3 Note that these studies were performed in healthy individuals: clearance of biotin could be different in individuals with renal impairment, with resulting prolonged concentrations of biotin or higher peak concentrations.