Centrium is my multi, and although it has a little biotin and a little niacin and a little zinc, I still felt like I needed to take targeted supplements when it comes to improving my hair and skin. So I take biotin, b-complex, and NAC<--an amino acid just for that extra boost. I need to up my protein intake as well. I think the Centrium keeps me balanced to help the others work affectively. But that's just me, you may be fine just taking the Centrium if your diet is already well balanced with enough nutrients for your hair. HTH!