This brand of Biotin was mediocre at best. It was still effective but not nearly as much as many other brands of biotin i have used in the past. I did see some noticeable results with my nails and slight skin improvement. There are some complaints about it having higher than desirable levels of mag stearate and dicalcium but i had no issue regarding those materials. The price is affordable but maybe at the cost of an less effective product.