How much biotin should I take for hair loss? Most of the websites touting biotin for hair growth recommend taking 2-5 milligrams (2,000-5,000 mcg) of biotin in supplement form each day, and many supplements are sold under the name Biotin 5000, indicating a 5000 mcg (5 mg) size.
How fast does biotin work for hair loss? It takes months to see results on biotin. According to The Journal of Clinical and Aesthetic Dermatology (source), biotin takes around 90 days to begin to work. Contrary to some of the claims you may have heard, biotin is not an overnight remedy that will magically give you 5 inches of hair growth in 24 hours.