Women often ask me what vitamins or minerals can they take to make their hair and nails grow faster or even to make their hails harder or thicker and, unfortunately, the answer is, none. The reality is that, unless you’re severely malnourished or unless you have a severe vitamin deficiency, taking extra vitamins and minerals just has no effect on your hair or nails. Lots of websites and advertisers recommend vitamin and mineral supplements, especially vitamin B6 and biotin, folic acid and beta-carotene, and the minerals, magnesium and zinc. But there’s no medical evidence to suggest that taking supplements of these minerals or vitamins has any effect on the growth of your hair or nails if you have a normal diet and you are normally nourished. Let me explain why.
The vitamins and minerals that you use for your hair and nails work in very, very small, tiny, minute amounts. And the small amounts that are present in everybody’s diet is sufficient to make your hair and nails grow normally. Those vitamins and minerals act like on/off switches. Let me give you an example. This lamp has a regular on/off switch with no dimmer. If I push the switch on, you get this much light. If I push harder as I am pushing now, the light doesn’t get any brighter. It works the same way with the vitamins and minerals in your body for hair and nails. The normal amounts you have will allow normal growth, and taking extra amounts have no effect on their growth. So, despite deceptive advertising, your hair and nails can’t be fooled.