I'm also wondering if my vitamins are doing anything for me. I currently take centrum for kids multi, gnc ultranourishair, 1000mcg of biotin, and flaxseed pills. Once I run out of these, I'm thinking of just switching to GNC women's multi, GNC Hair, Skin, and Nails formula and an essential oils blend (liquid formula) and that's it. I am not sure if the Ultranourishair has done anything. But I did notice my nails grew like a weed on the HSN formula so I would guess my hair grew faster, too and I really think it did. I find it odd that the product for Hair has really done nothing.