I started Menopause and have had a lot of trouble with my fingernails because of the lack of hormone production. The nail salon wouldn't even put fake nails on me for my daughter's wedding because the integrity of mine were so bad! I did some research and was already taking a supplement form of biotin as well as another one for hair and nails, so this became the "only thing left to try" solution. I haven't gone through the whole bottle yet but I have notice a remarkable improvement and actual healthy growth after only a week or so on these. Sometimes a vitamin deficiency is hard to figure out so I'm glad this has worked. I tried gelatin, horsetail, silica and several other things trying to solve my problem but this is the only thing that has shown results