My husband has a problem with dandruff. It is not excessive, but it is persistent.

Q For some strange reason my hair won’t grow. A friend suggested taking biotin, but when I looked it up in the internet it said that acne is a side effect. I’ve started taking B complex vitamins and a multivitamin. My tongue is also coated and there are a lot of red spots at the back of it — could the two be related? I’m taking 50mg of horsetail tablets every day. Is there anything else that you could recommend?