Research in the Journal of the American Podiatric Medical Association reported that red light therapy improved onychomycosis in 70% of participants after 12 weeks of treatment. Topical capsaicin has shown potential as a treatment for nail fungus (onychomycosis) due to its strong antifungal properties, supported by studies showing it can inhibit fungal growth, disrupt cell walls, and combat biofilms. Anecdotal reports indicate that capsaicin cream applied twice daily can eliminate nail fungus, with some users reporting undetectable infections within two weeks. National Institutes of Health.

Antifungal Mechanisms and Activity

• Biofilm Reduction: Capsaicin has been shown to reduce mature biofilms of Candida albicans by 70–89%.
• Cell Wall Disruption: It acts by preventing ergosterol biosynthesis in the cell wall, which alters the shape of fungal cells, disrupts their integrity, and causes cytoplasmic leakage.
• Targeted Species: Studies indicate high susceptibility of various Candida species (e.g., C. glabrata, C. tropicalis) to capsaicin, with significant inhibition of growth and biomass formation.
• Synergy with Antifungals: Capsaicin enhances the action of common antifungal drugs like fluconazole, offering a potential strategy to reduce drug resistance and lower required dosages. National Institutes of Health