They well only make a difference if your diet is not supplying you with ideal amounts of the vitamins and minerals in the hair vitamins. If you are already getting enough, it just makes expensive urine and overworked kidneys. I think it is better to get what you need from what you eat. If you do decide to use supplements, beware mega dosing. It can cause permanent kidney damage, which shortens your life and drains your energy terribly.
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