I have 24 years in the last years i lost hair in the front, the hair has become thin and lost volume. how much biotin should i take?

Enough comes in food: Biotin deficiency is rare, but can occur in persons with genetic mutations, on long-term antibiotics or anti-convulsants, or who eat a lot of raw egg whites. There is no good evidence that this easily available, over-the-counter supplement is the magic potion to grow hair or prevent hair loss. Biotin is safe to take at normal recommended doses (the Mayo Clinic website recommends 30-100 mcg a day).