I started using this biotin about 8 months ago, i noticed a huge difference in my hair. The tub drain wasn’t getting clogged and my hair which is normally very thin feeling, now feels much thicker. I did make the mistake of thinking that all biotin products were the same and ordered a cheaper brand of biotin, but is a well known brand. My hair started breaking , it wasn’t feeling like when i used this product. I have since switched back and i am already noticing the difference . My hair isn’t falling out nearly as much. I highly recommend this product