How much biotin should you take for hair growth?

Dosage, Preparation, and Safety

Still, people who support its use often recommend taking 2 to 5 milligrams (mg) of biotin in supplement form daily in order to strengthen hair and achieve results.

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How much biotin per day is safe?

To prevent deficiency, the amount taken by mouth is based on normal daily recommended intakes: Adults and teenagers—30 to 100 micrograms (mcg) per day. Children 7 to 10 years of age—30 mcg per day. Children 4 to 6 years of age—25 mcg per day.