Get real results fast. This product, powered by natural, soothing tea tree oil, improves the look of damaged nails quickly. Visibly reduces discoloration and thickness while hydrating nails to reveal smoother, healthier-looking nails. Easy-to-use brush tip makes application quick and mess-free. Drug-free, preservative-free, and paraben-free. Kerasal is the #1 Doctor-recommended brand for improving the appearance of fungus-damaged nails. For over a decade, Kerasal has delivered real, visible results. Millions have already seen the difference.