Signs of a biotin deficiency include fatigue, loss of hair, and brittle nails. Chat with your doctor about the right dosage, which is typically around 5 mg per day. Biotin is a popular vitamin ...

For example, a small 2012 study of patients with kidney failure who frequently experienced cramping during dialysis found that taking 1 mg of biotin daily immediately reduced cramping during and ...

One 2016 study found that 38% of women who experienced hair loss had biotin deficiency. The study authors suggest taking 5 mg ...

Biotin, selenium, zinc, vitamins A, Bs, C, D, and E, like in OLLY’s Perfect Women’s Multi, may help promote hair growth. If you have no known nutrient deficiencies, a dermatologist may have ...