I was wondering are the hair and nail vitamins safe to take along with a multivitamin ?

Qualified yes: Unless you have been specifically diagnosed with a vitamin deficiency, you are likely getting more than enough supplementation from your multivitamin and or routine diet. More and more data is coming out showing the potential adverse effects of taking vitamin and mineral supplements and that large doses can be detrimental - a much more common problem in this country than vit. Deficiency.