Are Vitamins Beneficial?

If you know me....then you know I've never been a big vitamin taker. Ever. I can never stay consistent with them! And I never notice a big difference from taking them so I usually stop because I think it's a waste of time. So after talking to one of my co-workers the other day I became motivated to give them a another try and now I'm taking this Hair, Skin, & Nails vitamin by Nature's Bounty. I've been very focused so far...it's only been 3 days though.lol. But I'm determined ya'll. I'm really going to give vitamins an honest try. What do you guys think? Do you take vitamins? If so, have you noticed a significant difference in your health, hair, skin, etc???? Let me know! I want to make sure I get my money's worth....