"i work in food service and have to wash my hands a million times a day, and use harsh sanitizer solutions and other cleaning products all the time. before i started to use this product i was also a notorious nail biter... since finding this my nails have gotten so much stronger!! i even have people compliment me on my nails (au natrel because i can't have even clear polish on at work). i literally can't bite my nails anymore, the only time my nails break is when i forget to do a treatment for a few weeks. great products."