Reviewed by Evan Lewis, PhD. Last updated July 2026.
If you're googling "does Fungi-Nail work" from a drugstore aisle, here's the straight answer: its active ingredient is a real antifungal, and its own label tells you where it works and where it doesn't. We make IodinePure, so weigh this comparison accordingly. We'll still give Fungi-Nail credit where credit is due.
Key takeaways
- Fungi-Nail's active ingredient is undecylenic acid 25%, a genuine OTC antifungal derived from fatty acids.
- Its own label targets fungus on the skin around the nail, and notes it is not effective on the nail bed or matrix. That's the spot where fungal-looking nails actually start.
- IodinePure EZ Clear Nails is 2 ingredients, elemental iodine and pure water, built around a 5 to 7 minute soak that reaches under and around the nail.
- Neither is overnight. Nails grow about 3mm a month, so plan on a 90-day routine with either bottle.
What Fungi-Nail actually is
Fungi-Nail is a brush-on liquid, also sold as a pen, with undecylenic acid 25% as the active ingredient. Undecylenic acid is a fatty acid derived antifungal that's been in OTC products for decades. It's inexpensive, and you can find it at almost any drugstore. All of that is real.
Now read the label closely. It targets fungus on the skin around the nail, the same organisms behind athlete's foot. And like other brush-on products, the label itself notes it is not effective on the nail matrix or nail bed.
That's not a knock on the ingredient. It's a limit of the format. A brush or a pen paints the top of the nail plate. The nail plate is a hard keratin shield, and the problem sits under it and around it.
What IodinePure actually is
IodinePure EZ Clear Nails is 2 ingredients: elemental iodine and pure water. Iodine's antifungal activity is documented in three published studies we break down here, and iodine has been used in foot and skin care since the 1800s.
The bigger difference is how it gets where it needs to go. The 90-Day Toe Kit is built around a 5 to 7 minute soak. Your toe goes fully under the liquid, so it reaches under the nail edge and into the folds along the sides, the places a brush tip never touches. Between soaks, a twice-daily spray keeps the routine going.
It's the same routine 200+ foot care clinics across North America send home with their clients, and it supports the look of clearer nails as the new nail grows out. It comes with a 90-day money back guarantee.
Side by side
| Fungi-Nail | IodinePure EZ Clear Nails | |
|---|---|---|
| Ingredients | Undecylenic acid 25% in a carrier liquid | 2 ingredients: elemental iodine and pure water |
| What it's built to do | Treat fungus on the skin around the nail (athlete's foot organisms) | Support the look of clearer nails with a daily iodine soak and spray routine |
| Application | Brush or pen painted on the surface | 5 to 7 minute soak plus twice-daily spray |
| Reaches under the nail? | No. The label notes it is not effective on the nail bed or matrix | Yes. The soak submerges the toe, so liquid reaches under the nail edge and into the folds |
| Availability | Most drugstores, low cost | iodinepure.com, ships across North America |
| Timeline | Months. Nails grow about 3mm a month | 90-day protocol, same nail growth math |
| Guarantee | Depends on the retailer | 90-day money back guarantee |
Our honest take
Pick Fungi-Nail if your problem is on the skin: peeling or itching around the toes, classic athlete's foot territory. It's a legitimate antifungal for exactly that, it costs little, and you can have it tonight.
Pick IodinePure if the problem is the nail itself. Thick, yellowed, fungal-looking nails start under the plate, and a routine that soaks the whole toe is built for that reach. That's why foot care clinics hand our kit to clients instead of pointing them at the drugstore shelf.
You can also run both. Plenty of people use a drugstore antifungal on the surrounding skin while doing the IodinePure soak routine for the nail. And whichever route you take, having a foot care professional thin a thick nail first helps any topical do its job.
IodinePure EZ Clear Nails 90-Day Toe Kit
Two ingredients. One routine. Built to reach where brush-ons can't.
✓ Elemental iodine and pure water, nothing else
✓ 5 to 7 minute soak reaches under and around the nail
✓ The routine 200+ foot care clinics send home
✓ Listed with Health Canada as a cosmetic
✓ 90-day money back guarantee
Start The 90-Day ProtocolCommon questions
Does Fungi-Nail work?
It can, for the job on its label: fungus on the skin around the nail. Its active ingredient, undecylenic acid 25%, is a recognized OTC antifungal. The same label notes it is not effective on the nail bed or matrix, which is where fungal-looking nails begin.
What are the ingredients in Fungi-Nail?
The active ingredient is undecylenic acid 25%, a fatty acid derived antifungal. The rest is the carrier liquid listed on the packaging. For comparison, IodinePure EZ Clear Nails has 2 ingredients total: elemental iodine and pure water.
Is the Fungi-Nail pen different from the brush-on?
Same active ingredient, different applicator. The pen is tidier to carry, the brush covers a bit more surface. Both paint the top of the nail plate, so neither changes what the label says about the nail bed.
Can I use Fungi-Nail and IodinePure together?
Yes. A common setup is the drugstore antifungal on the surrounding skin and the IodinePure soak routine for the nail itself. Give each one its own time slot so one dries before the other goes on.
The bottom line
Fungi-Nail is an honest drugstore antifungal for the skin around the nail, and its label is upfront about not reaching the nail bed. IodinePure is 2 ingredients and a soak routine built for exactly that reach, backed by a 90-day guarantee and 200+ foot care clinics across North America.
Check what's in the bottle, and know which job you're hiring for. We ran the same exercise in our Kerasal vs IodinePure comparison, and you can see the research behind the mineral in what the iodine studies actually show.
Evan Lewis, PhD, specializes in natural and nutritional therapies for the prevention and management of chronic diseases and their complications. His research spans chronic disease, diabetes complications, clinical nutrition, and nerve health, including the development of topical iodine therapy for foot care and wound health. IodinePure products are listed with Health Canada as cosmetics. Fungi-Nail is a trademark of its respective owner; ingredient information is from publicly available product labeling.
