Key Takeaways
- MyNuNail delivers 25% undecylenic acid with tea tree, snakeroot, and essential oils for direct antifungal action—Excilor uses organic acids to acidify nails
- Precision pen applicator makes MyNuNail mess-free and travel-friendly at $14.99 per 3mL unit (1–2 months supply)
- Undecylenic acid is an FDA-monographed antifungal for skin fungus (athlete's foot, ringworm); for nails, it is used off-label as a topical OTC care option
- Made in USA with 90-Day Money-Back Guarantee and Free 3–5 Day Shipping over $50
- Best for consistent adherence: file weekly, apply twice daily, continue 3x/week post-clearance to prevent recurrence
MyNuNail vs. Excilor: Which Antifungal Pen Is Right for Your Nails?
Choosing the right antifungal pen can feel overwhelming when you want clear, healthy nails—not another product that sits in your drawer.
MyNuNail and Excilor both promise results, but their formulas work differently. One targets fungus head-on with 25% undecylenic acid and powerful essential oils. The other acidifies your nail environment to slow fungal growth.
Your nail fungus deserves a treatment backed by researched ingredients, precision application, and real customer results. We're breaking down the formulas, convenience, and cost so you can decide which pen fits your nail health journey—no fluff, just facts.
Understanding the Formulas: 25% Undecylenic Acid vs. Organic Acids
The biggest difference between these pens? Active ingredients.
MyNuNail uses 25% undecylenic acid—an FDA-monographed antifungal for athlete's foot and ringworm—paired with penetrating essential oils like tea tree, snakeroot, and manuka. Undecylenic acid has demonstrated antifungal activity against dermatophytes and Candida species in laboratory and clinical studies. When combined with botanicals that have their own in-vitro antifungal properties, this formula is designed to target fungus while nourishing your nail bed for healthy regrowth.
Important note: Undecylenic acid is FDA-monographed for skin fungus. Its use on nails is off-label—a common OTC approach, but not an FDA-approved nail fungus cure. For moderate-to-severe cases, consult a healthcare provider about prescription options.
Excilor takes a different route: organic acids that lower nail pH, creating an environment where fungi struggle to survive. No direct antifungal active—just environmental control.
| Approach | MyNuNail | Excilor |
|---|---|---|
| Active Ingredient | 25% undecylenic acid + essential oils | Organic acids (pH adjustment) |
| Mechanism | Antifungal active + botanical oils for penetration | Acidifies nail to inhibit growth |
| FDA Status | Monographed for skin fungus; off-label for nails | Varies by formulation |
| Nourishment | Vitamin E, aloe vera, jojoba, sweet almond oils | Minimal moisturizing agents |
If you want an antifungal active with skin-soothing support, undecylenic acid formulas deliver a targeted approach. If you prefer pH manipulation, organic acids may appeal—but they lack a direct antifungal mechanism.
MyNuNail Antifungal Pen: High-Potency Precision
MyNuNail packs 25% undecylenic acid as the star antifungal, blended with tea tree, snakeroot, manuka, oregano, eucalyptus, clove bud, peppermint, and lavender oils. Add propolis extract, vitamin E, aloe vera, sweet almond, and jojoba oils, and you've got a formula designed to penetrate deep, fight fungus, and keep nails hydrated.
The precision pen features a twist-up brush applicator. No mess. No greasy residue. Just fast-absorbing relief that fits in your bag for on-the-go use.
- 3mL pen lasts 1–2 months with twice-daily use
- 24-month shelf life—stock up with duo or family bundles
- $14.99 single pen; bundles available for better value
- Made in USA with 90-Day Money-Back Guarantee
- Free 3–5 Day Shipping over $50
What does the research say about the ingredients?
- Undecylenic acid has been shown to inhibit fungal biofilm formation and disrupt hyphal growth in Candida albicans at concentrations above 3–4 mM (International Journal of Clinical Pharmacology and Therapeutics, 2016). A controlled trial of 104 patients with tinea pedis found that undecylenic acid achieved clinical and mycological cure in 53% of patients vs. 7% in untreated controls—though this was a skin study, not a nail study.
- Snakeroot extract performed comparably to ciclopirox (a prescription nail lacquer) in one randomized trial of 96 patients, with mycotic cure in 59% of patients receiving the extract vs. 64% for ciclopirox (Journal of the American Academy of Dermatology).
- Tea tree oil has demonstrated antifungal properties in vitro, though combined clinical data for nail fungus has not shown statistically significant benefit as a standalone treatment.
These ingredient-level results are promising, but they reflect studies on individual ingredients or different formulations—not on the MyNuNail product specifically. Nail fungus is notoriously difficult to treat topically because the nail plate limits penetration. For mild-to-moderate cases, a consistent topical routine with an antifungal active is a reasonable first step; severe or persistent infections may require prescription treatment.
Excilor Nail Fungus Treatment: The Acidification Approach
Excilor relies on organic acids to drop your nail's pH, making it tough for fungi to thrive. No undecylenic acid. No direct antifungal agents. Just environmental manipulation.
This approach may work for some, but it relies on creating unfavorable conditions rather than targeting fungal organisms directly. If you're dealing with stubborn, discolored nails, you may want a formula that includes an established antifungal active.
Side-by-Side Comparison: Convenience and Cost
Convenience: Twist-up pen applicator = zero mess. Quick-dry formula absorbs fast. Travel-friendly. Customers rave: "Precise and easy to use—no greasy mess, nails feel nourished." (4.6/5 Google rating).
Cost: $14.99 per pen (1–2 months supply). Bundles save you more. Free shipping over $50. 90-Day Guarantee means risk-free trial.
| Feature | MyNuNail | Excilor |
|---|---|---|
| Active Ingredient | 25% undecylenic acid + essential oils | Organic acids |
| Application | Precision twist-up pen | Varies by product |
| Price | $14.99 per 3mL pen | Typically higher per unit |
| Shipping | Free over $50 (3–5 days) | Varies |
| Guarantee | 90-Day Money-Back | Varies |
| Customer Rating | 4.6/5 Google | Varies |
Customers report visible improvement starting around months 3–4 with consistent use. Nail regrowth is slow—full toenail turnover takes 6–12 months—so patience and consistency are essential.
Decision Framework: Choosing the Best Treatment for Your Case
For mild-to-moderate nail fungus or maintenance, a high-potency topical with an antifungal active like undecylenic acid is a reasonable OTC starting point. MyNuNail combines this active with botanicals that have demonstrated antifungal properties in research settings.
Prioritize adherence: file weekly, apply twice daily, stick with it for 6–12 months. Topical treatments require patience, but consistent users see the best results.
Know when to escalate: If you don't see improvement after 8–12 weeks, or if you have severe infection, multiple affected nails, or underlying health conditions (e.g., diabetes), see a healthcare provider. Prescription oral antifungals like terbinafine have higher overall cure rates for nail fungus and may be necessary for tougher cases.
If you want environmental pH control without a direct antifungal active, Excilor may fit—but the approach is indirect. When comparing nail fungus treatments, consider whether you want an antifungal active or just pH modification. For those exploring other options, our guide on antifungal pen vs laser treatment breaks down the pros and cons of each approach.
Maximizing Results and Frequently Asked Questions
How to Use MyNuNail: File your nail surface weekly to remove debris and improve penetration. Twist up the pen. Brush precisely under and along the nail edge. Repeat twice daily. After clearance, continue 3x/week to prevent recurrence.
Timeline: Visible improvement typically begins around months 3–4. Full nail regrowth takes 6–12 months for toenails. Keep going—healthy nails start here, but maintenance keeps them that way.
FAQs:
- Safe for daily use? Yes. Minimal irritation reported. Natural ingredients soothe while they work. Discontinue if irritation occurs.
- Pricing? $14.99 per pen. Bundles available.
- Shipping? Free over $50 (3–5 days).
- Guarantee? 90 days. Hassle-free returns.
- Ingredients natural? Yes. Undecylenic acid (derived from castor oil), tea tree, snakeroot, manuka, oregano, eucalyptus, clove bud, peppermint, lavender oils, propolis extract, vitamin E, aloe vera, sweet almond, and jojoba oils.
- Is this an FDA-approved nail fungus treatment? Undecylenic acid is FDA-monographed for skin fungus (athlete's foot, ringworm). Its use on nails is an off-label OTC approach. This product is not intended to diagnose, treat, cure, or prevent any disease.
For a comprehensive overview, check out our best toenail fungus treatment guide. If you're weighing topical vs oral antifungal treatment or considering natural vs prescription antifungal treatment, we've got you covered. You can also explore our comparison of undecylenic acid vs ciclopirox to understand different active ingredients.
Order today. Free shipping over $50. 90-Day Guarantee. Healthier nails in three simple steps: file, brush, enjoy.
Statements made on this website have not been evaluated by the U.S. Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Information provided is not a substitute for individual medical advice.