I've been taking Biotin for almost 2 months & I've noticed great results so far. My hair has already grown 3 inches! Which is amazing since you usually grow about 1/2 an inch per month. I've also noticed that my hair doesn't shed as much either. I didn't experience any side effects while taking this. I was scared of trying it at first though because I saw a lot of people saying that they started to break out after taking it. But I figured I wouldn't experience that since I've never had a problem with acne or breaking out.