I first purchased a 5mg bottle and take it every day at lunch time. I had a lot of anxiety and have been biting my nails. Have been in constant prayer asking the Lord to help me deal with this anxiety and also because my hands look terrible with practically no nails at all. I am 60 years old go to say I want to get old gracefully which is also my prayer. I have used biotin from other brand and no deal. This putting the Lord first came my way reading and decided to try it. Sooooo I can say that the Lord works in mysterious ways. And I have long nails. Found this brand which need to say is very good. This is my second bottle but of 10mg this time for I got a better deal desided to subscribe hoping the price does not go up. I do recommend for me together with prayers the Lord has granted me what I so desired. Maybe you will find this a bit crazy, but the Lord has a lot to do with it.