biotin on my head

so, i use Nioxin to promote hair growth... and I think it works. At least, I don't appear to be losing hair rapidly. and I've noticed one of the ingredients is biotin -- you're applying it directly to your head... I suppose to improve the general health of your scalp. So I'm taking biotin in pill form in the mornings -- and applying it directly to my head in the form of shampoo...