Clinically proven NONYX Fungal Nail Clarifying Gel clears out keratin debris where nail fungus thrives. Keratin debris is the food supply of nail fungus. Once keratin debris (which looks either white, yellow or brown) is removed, nails are clear and healthy-looking again. Ninety percent of the people who used NONYX Nail Gel in a nine-month, clinical study saw significant improvement. NONYX Nail Gel is free of parabens and preservatives and is safe to use for diabetics with healthy feet. The four-ounce bottle is a six-month supply. Effective for toenails and fingernails damaged by nail fungus.