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Nature's Bounty Hair, Skin & Nails vitamin help?!?

I just bought this vitamin called Nature's Bounty Hair, Skin & Nails:

http://www.drugstore.com/qxp17613_333181_sespider/natures_bounty/skin_hair_and_nails_tablets.html

The bottle says that adults should take 3 pills a day, preferably with meals. I'm 15 and I was wondering if it is dangerous for me to take 3. I bought these since my hair was falling out a lot these past months and I was thinking that maybe my diet was the problem.

Does anybody know if it is harmful to take three a day, especially for a 15 year old girl?

Thank you!!