Reviewed by Evan Lewis, PhD. Last updated August 2026.
Nail repair patches work on appearance, not on what's under the nail. The gel pad hydrates and mildly exfoliates the top of the plate, which lightens discolouration. It can't cross the nail, because the plate is roughly half a millimetre of sulfur-rich keratin locked together by disulfide bonds.
This is a piece about the format, not about any one box. If you want a specific brand pulled apart, here's our line-by-line read of the Opti-Nail patch label and the same treatment for Kerasal. We make a soak, so you know where we stand.
Why is the nail plate so hard to get through?
Because it is built to be. A published review of transungual drug delivery measured nail plates at 0.4 to 0.5mm thick, roughly 80% sulfur-rich alpha-keratin, 10% to 30% water, and about 10.5% cysteine holding the keratin fibres together. Those cysteine bridges are the reason. They glue the sheets into something closer to armour than skin.
Skin lets things through because it's fatty. The nail behaves more like a dense hydrogel, and the same review calls out drug entrapment in nail keratin as the main obstacle to getting anything to the far side.
So the honest framing for every topical nail product, ours included, is not "how strong is it" but "where does the liquid physically end up".
Nail plate dimensions and composition from Chouhan and Saini, Journal of Drug Delivery 2014. Diagram drawn by IodinePure.
What does the patch format actually deliver?
Water, mostly, plus a mild acid. An adhesive pad is an occlusive dressing, so it stops the nail drying out for six or eight hours and softens the surface keratin. Add lactic or glycolic acid and the top layer of discoloured nail lifts a little. That's a genuine cosmetic result and it shows up fast.
What it can't do is deliver anything past that surface layer in a meaningful amount, and the patch makers don't claim it does. Read a patch box and you'll see "appearance", "renewal" and "look of" doing the work.
Can a patch even stay put on a bad toenail?
Often not, and this is the part reviews skip. Adhesive needs a flat, dry, low-grease surface. A fungal toenail is usually thickened, ridged and curved across its width, so the pad tents at the edges. Socks and bedding then peel it.
The nail folds are worse. Those are the strips of skin down both sides of the nail and the rim at the base, and a rectangular pad simply doesn't sit on them. Thin the nail first and adhesion improves a lot, which is why softening a thick toenail before you start anything is time well spent.
Is there any published evidence for nail patches?
None that we can find on patches specifically. No randomised trial of a fungal nail patch appears in the literature, which is worth saying plainly rather than dressing up.
The nearest evidence is for the liquid version of the same chemistry. Kerasal Nail, a propylene glycol, urea and lactic acid formula, went through an open-label study of 65 patients where 85% showed at least some improvement in nail appearance after four weeks. No control arm, and its authors state the efficacy measures were subjective.
For a sense of scale, the regulated products that are aimed under the plate publish modest numbers too. After a year of daily use, complete cure rates run 8.5% for ciclopirox lacquer, 9.1% for tavaborole and 18% for efinaconazole. The barrier is the barrier for everyone.
How do the four delivery formats compare?
Forget brands for a second and compare the physics.
| Format | How it stays put | Contact time a day | Under the free edge | Nail folds | Published human data |
|---|---|---|---|---|---|
| Patch | Adhesive gel pad on the plate | 6 to 8 hours overnight | No | No | None found on patches |
| Brush-on lacquer | Dries to a film on the plate | All day, film stays on | Only where it wicks | No | Ciclopirox 8.5% complete cure at 48 weeks |
| Soak | Liquid surrounds the whole toe | 5 to 7 minutes, submerged | Yes | Yes | Iodine case series, 8 of 13 culture-negative at 24 weeks |
| Spray | Wets the nail and the skin round it | Seconds, twice daily | Partly, it runs to the edge | Yes | Not studied on its own |
That last cell is our own format and we're not going to pretend otherwise. A spray is coverage between soaks, not the evidence base.
What should I soak my feet in for nail fungus?
Warm water and one active you'll actually use every day. The daily part decides more than the ingredient does, because a toenail takes 9 to 12 months to grow out and a soak you quit in week three does nothing.
These are the ones people mean when they ask for the best foot soak for toenail fungus, and what each is really doing in the bowl.
| Soak | What it is doing | The catch |
|---|---|---|
| Vinegar | Drops the pH of the water | Household vinegar is about 5% acetic acid, then it gets diluted again in the basin. Cheap and harmless, thin evidence. |
| Epsom salt | Softens skin and nail before trimming | A preparation step rather than an active. Genuinely useful the night before you cut a thick nail. |
| Listerine | Alcohol plus thymol and eucalyptol | Tints the nail amber and dries the skin around it. We went through what the Listerine soak does and where it runs out separately. |
| Bleach | Sodium hypochlorite, heavily diluted | The one with a real downside attached. Next section. |
| Iodine | Elemental iodine in water | What our own tray uses. The published papers on iodine and toenails are linked further down. |
Whichever you pick, the thing that separates a good soak from a bad one is contact. Whole toe under the liquid, five to seven minutes, daily, for as long as the nail takes to grow out.
Is a bleach foot soak for toenail fungus safe?
It is the one home soak worth thinking twice about, because the risk sits on your skin rather than in the theory. Sodium hypochlorite is a genuine disinfectant, which is exactly why people reach for it.
What people do is tip a capful or two of household bleach into a basin of warm water and sit in it for ten minutes. What the instructions leave out is that nobody agrees on the dilution, bleach strength varies by brand and by how long the bottle has been open, and the skin between your toes is thin and often already cracked if there is fungus in the picture.
Dermatology does use very dilute bleach in some skin conditions, but that is a measured dilution set by a clinician for a named purpose. It is not a capful in a basin.
Two other things worth knowing. Bleach bleaches, so it lightens the surface of the nail and the nail can look better while nothing under it has moved. And if your skin stings, reddens or peels afterwards, that is the soak talking, not progress.
We sell a soak, so read that how you like. We would still rather you used something you can put your foot into every day for nine months without your skin objecting.
What actually changes the outcome?
Three things, and the product is only one of them.
Nail growth sets the ceiling. Toenails were measured at 1.62mm a month in healthy young adults, so a full toe takes 9 to 12 months to replace itself. Nothing in any bottle speeds that up.
Debridement changes what reaches the bed. Less nail in the way, less distance for anything to travel. Book it, then follow the aftercare in the week after the nail is thinned.
And your house re-seeds the problem. A scoping review in the Journal of Fungi found transmission in 44% to 47% of households with an affected member, with dermatophytes persisting in the home environment for up to 18 months. Shoes, bath mats, nail clippers. Treating the nail and ignoring the footwear is why people go round twice, which is the case for a routine that covers the gym bag as well as the toe.
Why we built the kit around a tray
The format question is the one we actually argued about when we designed the EZ Clear Nails Starter Kit. A bottle and a brush would have been cheaper to ship. We went with a soak tray because a liquid that surrounds the toe is the only home format that ends up under the free edge and down both nail folds at once, and because five minutes of submersion beats a smear that dries in twenty seconds.
What's in the tray is elemental iodine and pure water. Two ingredients, no alcohol, so it doesn't sting and doesn't stain skin or socks. Iodine has its own ingredient-level research record, including a 2020 review describing how it penetrates microorganisms and oxidises their proteins, nucleotides and fatty acids, and we go through the three published papers on iodine and toenails without inflating them. It's the routine 200+ foot care clinics across North America send home, and the Sole Shield foot and shoe spray handles the footwear half of the problem.
EZ Clear Nails Starter Kit
The format that gets under the edge.
✓ 5 to 7 minute soak, whole toe submerged
✓ Two ingredients, no sting, no staining on skin or socks
✓ The routine 200+ foot care clinics send home
✓ 90-day money back guarantee
Common questions
Do nail repair patches work?
They work on appearance. Occlusion softens the surface overnight and mild acids lighten discoloured keratin, so the nail looks better within a couple of weeks. No randomised trial of a nail patch has been published, so nothing is established about what happens beneath the plate.
Do nail patches contain an antifungal ingredient?
Usually not. Typical patch labels list water, glycerin, a urea derivative, lactic or glycolic acid, and gelling agents. Some brands sell a separate antifungal step in the same box, so read which item you are holding and check the drug facts panel rather than the front of the pack.
Can a patch reach under the toenail?
No. An adhesive pad bonds to the top of the nail plate, and the plate is 0.4 to 0.5mm of dense keratin. The space under the free edge and the skin folds down both sides stay dry, and those are the areas a submerged soak covers in one go.
Are patches better than a brush-on lacquer?
They do different things. A patch is occlusion plus mild acid for appearance. A lacquer is a drug film aimed at the plate, and even the regulated ones report complete cure around 8.5% to 18% after a year. Neither format reaches the nail folds.
What works better than nail patches for a fungal-looking nail?
Change the format, not the brand. Get the nail thinned by a foot care professional, then use something liquid that surrounds the whole toe so it reaches under the edge and down the folds, and deal with your shoes at the same time. Then give it 9 to 12 months of new growth.
Do pimple patches work better than nail patches?
On skin, within their limits, yes. A hydrocolloid dot sits on soft permeable tissue and pulls fluid out of an open spot overnight, and you can see the difference in the morning. A nail patch is the same idea pointed at 0.4 to 0.5mm of dense keratin, so the result stops at the surface. Same format, completely different barrier. The acne version has its own breakdown of where pimple patches disappoint.
The bottom line
A patch is a good appearance product held back by physics. It touches one surface, it has no published trial behind it, and it can't stay on a badly thickened nail. If you want a nicer-looking nail next month, that's a fair buy. If you're thinking about the nail growing in at the base, pick a format that can physically get there and give it the 9 to 12 months your toenail needs.
More on the specifics: what the Nonyx gel is built to do, how to tell fungus from a bruise or a nail injury, and why most routines stall around month three.
References
- Chouhan P, Saini TR. Hydroxypropyl-beta-cyclodextrin: a novel transungual permeation enhancer. J Drug Deliv. 2014;2014:950358. PMC4142161
- Pan JY, Tan CL, Toft A. Rapid visible improvements in onychomycosis: an open-label clinical investigation of Kerasal Nail. J Cosmet Dermatol Sci Appl. 2017;7(1). Full text
- Leung AK, Lam JM, Leong KF, et al. Onychomycosis. StatPearls, NCBI Bookshelf. NBK441853
- Jazdarehee A, Malekafzali L, Lee J, Lewis R, Mukovozov I. Transmission of onychomycosis and dermatophytosis between household members: a scoping review. J Fungi. 2022;8(1):60. PMC8779452
- Yaemsiri S, Hou N, Slining MM, He K. Growth rate of human fingernails and toenails in healthy American young adults. J Eur Acad Dermatol Venereol. 2010;24(4):420-3. PubMed 19744178
- Lepelletier D, Maillard JY, Pozzetto B, Simon A. Povidone iodine: properties, mechanisms of action, and role in infection control. Antimicrob Agents Chemother. 2020. PMC7449185
- Capriotti K, Stewart KP, Pelletier JP, Capriotti J. Treatment of onychomycosis with dilute topical povidone-iodine in a dimethylsulfoxide solvent system. Clin Res Trials. 2016. Full text
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 approaches for foot care and wound health. IodinePure products are listed with Health Canada as cosmetics. Brand names are trademarks of their respective owners, and the ingredient descriptions here come from publicly published product labeling and the sources listed above.
