Restore healthy nails
A precision anti-fungal pen with 25% undecylenic acid targets discoloration and brittleness, revealing clearer, stronger nails in as little as 4 weeks.
From hiding your feet to barefoot confidence
How a targeted treatment turns a stubborn problem into a simple daily habit.
The hidden struggle
You know the feeling: avoiding sandals, skipping poolside barefoot moments, constantly checking if your nails look normal. Over-the-counter creams fail because they can’t reach the nail bed, and oral meds come with risks. It’s frustrating, and it chips away at your confidence.
A reliable solution
Our precision pen puts 25% undecylenic acid right where it’s needed. The brush tip paints a thin, fast-drying layer over the nail and under the edge—exactly where fungus hides. No mess, no guesswork.
Clear, resilient nails
Day by day, the discoloration fades. Nails grow back stronger, smoother, and naturally clear. By week 8, the change is visible—and the freedom to show your feet comes back without a second thought.
Three reasons it actually works
Every detail is engineered to overcome the shortcomings of generic antifungal treatments.
Clinical-strength formula
25% undecylenic acid—the same active ingredient recommended by podiatrists—delivers profound antifungal action without prescription side effects.
Precision brush applicator
The fine tip reaches under the nail edge and around the cuticle. You control exactly where the treatment goes, so nothing is wasted.
Quick-dry, no waits
Formulated to dry in under 10 seconds, the clear liquid disappears under socks or hosiery. Fits seamlessly into your morning or evening routine.
Key ingredient
What makes this treatment clinically effective.
- [HERO]Undecylenic AcidAntifungal agent
3 minutes to healthier nails
Simple steps that fit any morning or evening routine.
- 01
Clean and dry
Wash the affected toe with mild soap and water, then dry thoroughly. Any moisture shields the fungus.
- 02
Shake and twist
Shake the pen briefly, then twist off the cap to expose the precision brush tip.
- 03
Brush on
Paint a thin layer over the entire nail surface and under the free edge where fungus often hides.
- 04
Let it dry
Wait 10 seconds until the liquid sets clear. It won’t rub off on socks or shoes.
What to expect week by week
A realistic timeline for nail recovery with daily application.
- DAY 1
Start of treatment
Begin applying to clean, dry nails. The liquid dries clear in seconds—no disruption to your day.
- WEEK 2
Initial softening
You may notice the affected nail feels slightly softer. Discoloration might look less pronounced.
- WEEK 4
Visible change
New nail growth near the cuticle appears clearer. Dark spots begin to recede.
- WEEK 8
Healthy appearance
The majority of the nail looks smooth and natural. Continue treating until the entire nail has grown out.
By the numbers
The figures that matter when you’re dealing with nail fungus.
Technical specifics
Every detail verified against the product’s fact sheet.
- Active ingredient
- Undecylenic Acid 25%
- Volume
- 4 ml / 0.14 fl oz
- Applicator
- Precision brush tip
- Form
- Clear liquid, quick-dry
- Shelf life
- 3 years (unopened)
- Pen dimensions
- 13.5 × 1.2 cm
- Box dimensions
- 16 × 5 × 2.5 cm
- Weight
- 22 g (pen only)
Scale in context
Compact enough to slip into any toiletry bag.
- Pen height 13.5 cm
- Pen diameter 1.2 cm
- Box length 16 cm
Roughly the size of a premium felt-tip marker.
Everything you get
One complete kit for a full month of treatment.
- Fungus treatment pen×14 ml, 25% undecylenic acid
- Premium navy box×1Keeps the pen protected
- Usage instructions card×1Step-by-step with tips
Why this pen outperforms
See how it stacks up against common alternatives.
| This PenBEST | Typical Cream | Oral Medication | |
|---|---|---|---|
| Targeted delivery | ✓ | ✗ | ✗ |
| No systemic side effects | ✓ | ✓ | ✗ |
| Quick drying | ✓ | ✗ | — |
| Mess-free application | ✓ | ✗ | — |
| Penetrates nail bed | ✓ | Partial | ✓ |
| OTC availability | ✓ | ✓ | Rx needed |
Third-party assurance
The quality and safety credentials behind this formula.
- Dermatologist-testedSafe for topical use as directed
- USP Grade ActiveUndecylenic acid purity verified
- ISO 22716Manufactured under cosmetic GMP
- Featured in Wellness Today· “Top 5 nail care innovations”
- Podiatry Weekly Pick· “Best OTC antifungal for travelers”
Honest feedback
People who went from hiding their feet to flaunting them.
After years of thick, yellowed nails, I saw a real difference within two months. The pen makes application so precise.
My podiatrist mentioned undecylenic acid, and this pen is the easiest way to use it. No odour, no mess.
My nails look smoother and the discoloration is almost gone. I’m wearing open-toed shoes again.
After years of thick, yellowed nails, I saw a real difference within two months. The pen makes application so precise.
My podiatrist mentioned undecylenic acid, and this pen is the easiest way to use it. No odour, no mess.
My nails look smoother and the discoloration is almost gone. I’m wearing open-toed shoes again.
It’s neat and fast. I do wish the pen held a bit more product, but a little goes a long way.
It works, but you have to be consistent. I missed a few days and progress slowed. Stick with it!
Good product, but I wish it came in a larger size. I’ll reorder.
It’s neat and fast. I do wish the pen held a bit more product, but a little goes a long way.
It works, but you have to be consistent. I missed a few days and progress slowed. Stick with it!
Good product, but I wish it came in a larger size. I’ll reorder.
I’d tried three creams before this. The brush tip is genius—it gets under the edge where the problem grows.
Finally, a solution that doesn’t involve messy liquids or cotton swabs. The twist cap is great for travel.
As a swimmer, I battled fungus for years. This pen is the only thing that’s kept it in check.
I’d tried three creams before this. The brush tip is genius—it gets under the edge where the problem grows.
Finally, a solution that doesn’t involve messy liquids or cotton swabs. The twist cap is great for travel.
As a swimmer, I battled fungus for years. This pen is the only thing that’s kept it in check.
Your questions, answered
Honest answers for the cautious buyer.
How long before I see results?
Is this safe for sensitive skin?
Can I use it on fingernails?
How does undecylenic acid work?
Is the pen refillable?
What if I don’t see improvement?
Ready to love your nails again?
The precision pen fits any routine. Start seeing clearer, stronger nails in weeks.