Best OTC nail fungus treatment refers to the most effective over-the-counter products used to treat mild to moderate fungal nail infections. These treatments typically include antifungal creams, medicated nail lacquers, and treatment pens containing ingredients like clotrimazole, terbinafine, or undecylenic acid. Popular options such as Kerasal, Fungi-Nail, and Lamisil cream are designed to reduce discoloration, thickness, and brittleness over time. Consistent daily use and proper nail care are key to seeing visible improvement. For more advanced infections, a doctor may recommend prescription treatments.