Formula 3 is a topical agent used to treat stubborn nail fungus. Formula 3 is great to give to our patients so they can proactively treat their nail fungus. Often times it is combined with laser therapy to increase the chance of complete cure. It works great alone if you only have a mild case of onychomycosis or fungus in your nails. With its easy brush on application and no drying time, patients love the convenience and effectiveness of this product. We know it works so well, the company is willing to refund, 100% of your money, if you are not 100% satisfied.