NonyX Nail Gel breaks down and clears out dark or yellowing keratin debris under the nail. Once keratin debris is removed, nails look clear and healthy again. In a clinical study, NonyX produced statistically significant improvement in nail appearance, compared to placebo, between 3 and 9 months, depending on the size of the toenail. NonyX is the choice of doctors, used by podiatrists and is safe, even for diabetics with healthy feet, has no preservatives and is paraben free.