This oil is a magical care. I bite my nails regularly and when I decide to stop, this is the only treatment that have allowed me, in a short time to restore the top of my very damaged nails and make them grow "fortified and hard." I discovered this in the 1980s, then disappeared from circulation. Thank you Amazon, today, I order this oil and other Barielle products, unsurpassed with all the products of other brands (and yet I have tried in one package !!!), which are very very far from offering such a result !!!