Fanie Intl. makes an interesting product called Instant Nail Hardening treatment. The ingredients are hydrolyzed keratin, sulfer extract, water-soluble petroleum, ascorbic acid, vitamin A, mint oil & P.C.M.X. which is a natural bactericide that prevents spoilage. It works. A LITTLE GOES A VERY LONG WAY. I have solar nails, thin, brittle underneath no matter how great my diet or supplements are - just the nature of the beast. This works. Of course my nail fill bill got higher bec. my nails grew faster too....small 1/4 ounce red gel-like use only a teeny tiny bit & massage it into cuticles & nails on hands & feet. The larger size will last me a year.