Is it safe to take 5,000 mcg pills of biotin while breast feeding?

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 5000 mcg per day is over 30 times the usual dose, so is not advisable.