Home Nail & Foot Antifungal Nail Pen

Antifungal Nail Pen

Last updated on Apr 18, 2026

Maximum-strength topical therapy for nail fungus, formulated with 25% undecylenic acid — the highest OTC-strength antifungal active available.

What it does

Treats the fungal infection that causes nails to become:

  • Thickened, yellow, or discolored
  • Brittle or crumbly at the edges
  • Lifted or separating from the nail bed
  • Developing debris underneath

Also treats the surrounding skin so the infection doesn't seed back into the nail after it clears.

Active ingredients

  • Undecylenic acid 25% — clinically-established OTC antifungal; disrupts the cell walls of the fungi responsible for nail infections
  • Tea tree, oregano, manuka, and clove bud oils — natural antimicrobials for added support
  • Propolis extract — supports skin healing
  • Vitamin E (tocopheryl acetate) — nourishes the nail and surrounding tissue

How to use

  1. Clean and dry the affected nail and surrounding skin. Gently file down any thick areas.
  2. Click the pen until the brush tip is saturated (first use may need a few clicks to prime).
  3. Paint a thin layer over the entire nail, letting it flow under the front edge and onto the surrounding skin.
  4. Let it dry fully (1–2 minutes).

Apply twice daily — morning and night — for best results.

Expected timeline

Nail fungus is stubborn because the infection lives in the nail matrix, and nails grow slowly. Realistic expectations:

  • Weeks 2–4: Active fungal growth slows; nail feels less brittle
  • Months 2–3: Clearer new nail starts growing out from the base
  • Months 6–9: Most users see full clear-nail replacement as the healthy new nail fully grows in

Consistency matters more than anything — skipping applications lets the fungus recover.

Important

  • Diabetic? Talk to your healthcare provider before using any foot antifungal.
  • Patch test first if you have sensitive skin or known sensitivities.
  • Keep using it for 2–4 weeks after the nail looks clear to prevent reinfection.

Pairs with

  • Antifungal Foot Balm — for the surrounding skin
  • Antifungal Relief Soap Bar — daily cleansing
  • Foot & Shoe Spray — disinfect shoes to prevent reinfection