well, after researching multiple threads about biotin, i take close to 13mg.day. i take 2 5mg tabs, and a hsn vitamin that contains 3mg. it sounds like alot, but i found that if i take a vitamin c supplement, and a b complex, and make sure to wash with an acne wash, and exfloiate daily, and pay extra attention to my skin, i dont get as many breakouts. i normally suffer from acne, so it wasnt a huge deal for me to get a few extra bumps. however, the pimples you do get, are more cystic like, and occur in the chin area. but i've found that with the additional measures i take, the breakouts are few and far between. i have noticed that my eyebrows grow like crazy, and i often have to get them tweezed or waxed. (i used to always have thin eyebrows, so this is new.) i also have to wax/shave everywhere alleast once/week. again, this is unusual for me, b/c i'm not a hairy person. i never used to have to shave my legs bc i never had hair on my legs. i've noticed that my hair has grown alot more, to lengths that i've never had. and everyone has noticed and comments. so, if i can stick to my vitamin regimin, i can hopefully reach my goals within the next year or two. the only area i've found hair growing, is above my upper lip, and it's not noticeable, but it did freak me out when i first noticed it. other than that, no chest hair, or chin hair, or other crazy place hair shouldn't be growing.