Using biotin 10,000 for hair grow an multivitamins at the same time,is it safe?

Seems very unnatural: Not a natural thing to do. 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 for anything. Biotin is safe to take, but 10000 mcg per day is over 60 times the usual dose, so is not advisable.