NONYX is clinically proven to combat the common signs of fungal damage seen on discolored, dark, yellow, rough, thick, lifted, thin, ridged and brittle toenails and fingernails. Using NONYX 90% of nails improve, based on a double-blind, placebo-controlled clinical study. The unique formula contains ethanoic acid which combats the effects of toe nail damage by breaking down yellowing keratin debris (the habitat and food supply of nail fungus). A podiatrist and dermatologist recommended nail treatment since 2004. Over 8 million bottles sold in the USA alone. Safe for diabetics with healthy feet. Eligible for HSA and FSA health insurance reimbursement. Even works under nail polish. Enjoy wearing polish while you restore their healthy-looking appearance. Apply just 3 times a month or when you change your polish. Works best with acrylic-based polishes. Made in the USA and economical. Each bottle is a 6-month supply. The 4-ounce bottle is at least 3 times more than most other brands. Free of parabens and preservatives, naturally-sourced ingredients, vegan, easy to apply, non-staining, dries clear and odor free, easy to remove. Maintains clear, smooth, healthy-looking nails with regular use.