Strictly for what it's worth, I tried Biotin Forte (biotin with important zinc recommended for chemo patients by another renowned Clinic) to grow stronger nails. It didn't work so I gave it to a male friend who was in a long post-surgery rehab facility. It stopped his hair from falling out and he was in the throes of congenital male pattern baldness that left his male relatives shiny-domed. He ran out of it for a week and hair loss resumed at the former schedule and stopped when he resumed taking it.