Kerasal Fungal Nail Renewal isn’t an antifungal — it’s a urea-based keratin remodeler. It softens thickened fungal nails, improves appearance within 2 weeks, and creates an environment where the patient’s immune system can actually reach the fungal organism. I recommend it as supportive care for mild cases and as cosmetic bridging during oral terbinafine therapy. It will NOT cure an established fungal nail infection alone — that requires 3 months of oral terbinafine, laser treatment, or Jublia (prescription efinaconazole). Daily use, 48 weeks for cosmetic-level clearance on a single great toenail.

Fungi-Nail (undecylenic acid 25%) is the highest-strength OTC topical antifungal available in the US for nail use. Undecylenic acid disrupts fungal cell membranes and penetrates the nail plate better than tolnaftate or miconazole. Real-world efficacy is modest — roughly 20-30% of mild cases clear with 6 months of daily use — but it’s the best OTC option before escalating to prescription therapy. Apply twice daily. If no improvement at 3 months, escalate to Jublia or oral terbinafine.

Not a medical product per se, but 15 minutes of foot soak in diluted Listerine (1:1 with water) has actual clinical literature behind it for fungal suppression — the thymol, eucalyptol, and methyl salicylate are all mild antifungals. I don’t claim it cures nail fungus, but as a twice-weekly adjunct to Kerasal or Jublia, the mechanism is real and patients like the ritual. $8 for a bottle that lasts 3 months. Doesn’t replace real antifungal therapy. Do not use on broken skin or immediately after pedicure.