Researchers have identified hydrogen sulfide as a potentially effective treatment for fungal nail infections. In laboratory conditions, this gas can penetrate the nail plate significantly better than current local drugs and disrupts the energetic processes of fungi and bacteria, thereby killing them[1][2]. The effect of hydrogen sulphide was also shown in fungal strains resistant to common antifungals[2]. However, research is currently only being conducted in the laboratory, safety and effectiveness on humans have not been verified[1]. Nail infections affect approximately 4–10% of the population, with the incidence increasing with age[1]. Current treatments include antifungal varnishes, solutions and gels, but they are not always effective[3]. Hydrogen sulfide could be a new alternative for patients with hard-to-treat nail fungus in the future if its safety and effectiveness are confirmed[2].