I have been using biotin for about a year now without noticing a difference! My hair and nails are the same strength and neither have grown any faster.

I started taking Biotin and it did help with my hair shine and I thought my nails were getting a little stronger but I had to stop due to side effects. Acne was starting to flair up on my face and shoulders and I wasn't always feeling the best. I'd say take this at your own risk!