NONYX was formulated for the purpose of providing an effective, drug-free solution for fungal toenails and fingernails. The formula is based on the fact that nail fungus lives within keratin debris and keratin debris is also the food supply for fungus. The unique formulation breaks down and cleans out keratin debris, taking the fungus with it. NONYX has been clinically proven to significantly improve 90% of nails, based on a 9-month clinical study. In many cases of darkened or discolored nails, nail fungus is, in fact, absent. These nails are burdened by unsightly keratin debris buildup from some other cause. However, NONYX Nail Gel also improves the appearance of these nails, working as general nail treatment for discolored, damaged, brittle, lifted or thickened nails. NONYX is free of parabens and preservatives and is safe to use for diabetics with healthy feet. NONYX has been a top-selling personal care brand for fungal nails since 2006. The 4 ounce bottle is easy to use and provides a 6 month supply. Results are money-back guaranteed. Made in the USA. Not tested on animals.