9 Best Anti-Fungal Nail Polish | The Pen That Beats Creams

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A twist-to-release pen that puts a 25% undecylenic acid formula exactly on the nail edge.

This is the one for the person whose fungus sits in a corner. The pen tip is the whole point: you twist the bottom, the product feeds to the tip, and you draw it directly along the nail edge and the skin beside it. A 5.94 x 2.95 x 0.94 inch package at 2.48 ounces is chunky enough to store flat yet small enough for a dopp kit, and you get four pens in the box — a genuinely useful detail if you want one in the bathroom drawer and one in your bag.

The formula is 25% undecylenic acid, an antifungal that’s commonly used in nail treatments, and it is paired with tea tree oil, almond oil, and vitamin E. The oils are what keep it feeling mild rather than harsh, and they also soften a dry, rough nail surface over time. Salon clients show up repeatedly in the owner reviews — one person traced a salon infection on a big toenail that had barely grown, flaky and breaking off, and described healthy new growth eventually attached and improved after working through it with the pen.

Here is the trade-off: this formula wants a completely bare nail. One long-time user described deliberately keeping nails polish-free so the product goes straight on, and that’s the right way to run it. If you live in polish, this pen is going to be annoying. Applied twice daily over 15 to 30 days is the label’s suggestion, with the honest note that duration depends on how thick the affected nail is. And you should not expect a full box to disappear quickly — one owner said they bought a box of four pens and were still working on the very first one.

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The one built for polish-and-go schedules: a lacquer that stays put for days, sold as a kit.

Most antifungal liquids demand a two-a-day ritual. This one asks for far less, and that’s its whole case. Apply it once every 3 to 4 days for at least 4 weeks, and it works between applications. The formula is 5.31 x 2.8 x 1.06 inches and comes as a solution plus five nail files, so the prep step is in the box. It’s also priced around mid-range tier for the group, which fits a kit that includes tools.

Two things make it stand out from the liquids above it. First, it’s lacquer-based, meaning the film doesn’t wash or rub away easily — so ordinary nail polish goes on top of it and can stay there. Second, it uses urea, vitamin B, and spirulina algae extract to address the visible signs of toenail fungus damage: discoloration, brittleness, ridges, thickness, and roughness. On bare nails it adds a natural shine, which is a small thing that makes a real difference in how a nail reads in sandals.

Kerasal is a brand many shoppers recognize, and Kerasal is a widely stocked drugstore brand, and the kit is HSA/FSA eligible.. The fair caveat is longevity: the lacquer film can thin or disappear before the day is out on some people, and since the product runs on a 3 to 4 day cycle, that gap may bother you. It’s a fit question — if your nail sees a lot of sock-and-shoe friction all day, plan on keeping an eye on coverage.

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Two 15 ml bottles of 25% undecylenic acid, one formula, enough for a full treatment run.

For anyone treating more than one nail, the math here is straightforward. This is a two-bottle set of 15 ml each — that’s twice the supply of the single-bottle picks — and it carries the same 25% undecylenic acid plus tea tree oil formula as the pen, but in a liquid solution you apply twice daily. It is also dermatologist-tested for daily use.

What buyers describe most is that it works and that it does so quietly. There is no clingy medicinal smell — it’s noted as odorless, which is the detail that decides whether you actually stick with a twice-daily schedule. It also dries quickly, so you’re not waiting around with wet toes. And the two-bottle format lines up with the label’s own expectation: apply twice daily and expect visible improvement in nail clarity, texture, and resilience over the treatment period. A full cycle is not a short one, and having a spare bottle means you’re not re-ordering mid-run.

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A 1.01 fl oz brush-tip bottle that treats several nails without running dry in a month.

Bigger bottle, same active strength. This one comes as 1.01 fl oz (30 ml) with 25% undecylenic acid, which is the largest single-bottle format in this group. If you are treating both feet, that size is the whole reason to pick it — you will cover the full run without watching the level drop. The bottle is also reasonably compact at 0.71 ounces and 4.25 inches tall, so it lives on a shelf or packs for travel.

The built-in brush applicator is the other strong point. It lets you sweep the liquid directly and evenly across the nail surface and the surrounding skin in a single pass, which is faster than a rollerball that needs a second swipe on a wide nail or a pen that gets used up slowly. The formula is aimed at the visible side of the problem, working on dry, rough, dull, discolored-looking or uneven-looking nails for a cleaner, healthier-looking finish. Confident expectations, but the same patience rule applies — this needs steady daily use before you see a difference.

Owners describe it as easy to apply and pleasant to use, with no irritation — a trail of comfortable repeat applications that makes a twice-daily routine sustainable. Where other picks in this list nail down a very specific job — a pen for edges, a lacquer for polish, a dropper for precision — this one is the unglamorous workhorse: plenty of product, a clean brush, and a low-maintenance routine. Not much drama, but not much to go wrong either.

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A clear polish you apply weekly, so it lives in the manicure kit, not the medicine cabinet.

This is the odd one out in the best way. It’s not a liquid you drip onto a nail — it’s a clear anti-fungal polish top coat that you paint on like regular polish and leave for the week. That weekly schedule is the draw for anyone who finds twice-daily application impossible to maintain. Applied in thin layers, it dries to a shine and behaves like the top coat it is. You don’t need to repaint mid-week and you don’t need to plan around wet toes.

Because it’s a polish, one detail is non-negotiable: thin coats. Thick layers peel, which is exactly what the smoother, thinner technique avoids. The recommendation appears in owner accounts of long use — one repeat buyer who has kept coming back describes it as effective when used consistently and a great product for a top coat that dries quickly, while another points out the polish coming off in sheets a week later. The honest read is that technique and prep matter more here than on a liquid, since a polish film has more to flake if the base is uneven.

It’s also worth saying what this is not: it’s a clear top coat, not a color, so it’s not the pick if you want a tinted formula. There are limited color options in the line, and the reviews on those colors are mixed — clear is the version most owners stick with.

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A dropper that lands the liquid right on the spot, no brush, no rollerball, no spills.

Some people just get along better with a dropper. This is BeamBalm’s fungal nail liquid in a one-pack dropper format — you squeeze a drop directly onto the affected area and it absorbs fast into the nail bed. The package is 6.02 x 4.37 x 1.61 inches and weighs 2.47 ounces, so it sits flat in a drawer without tipping. It’s non-irritating and designed for daily use, and the label positions it as a full-service formula: penetrate at the source, prevent further shedding or damage, restore discoloration and thickness over consistent use, and support natural regrowth on both fingers and toes.

The word you’ll notice in owner experiences is “quick.” Some report that it works fast, while others see nothing change at all — effectiveness is genuinely divided among buyers, so it lands differently person to person. What does hold up regardless of the active’s outcome is the build quality: owners rate the product’s quality highly across the board, and the dropper is precise enough that a single controlled drop is enough for one spot. Given the mixed effectiveness, the right way to think about this one is a formula to try if the liquid-and-dropper format matches how you like to work — not a guaranteed result.

Containers of this type also need to stay upright and capped; leaving the dropper loose invites oxidation and clumping at the tip, which is easy to do on a bathroom counter. A single pack is also a fair amount of product for a small job, so treat it as a full-run purchase if your concern is one or two nails.

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Two brush-tip bottles, a nail file, and a simple routine laid out step by step.

This kit is built around the clean-and-file routine: clean and dry the nail, gently file if needed, sweep on a thin layer with the built-in brush, and let it dry before socks or shoes go back on. The two bottles each carry a brush and the set adds a nail file, so you get a second bottle for keeping somewhere else, and the tool for the prep step is in the box.

The active is 25% Undecylenic Acid as shown on the Drug Facts panel, intended for external use as part of a regular nail care routine. Confirmed results are mixed: ease of use is what people consistently agree on — the brush makes targeted application around the nail edges neat and mess-free — and some call it the best option for a toenail, while others report no change or a damaged nail bed. That gap is the same formula-you-must-tolerate story you see across the category. What the kit does well is take variables out of the process: brush, file, and a stated routine mean you have fewer excuses to skip a step.

It’s also worth comparing the format: the 2-pack is smaller and easier to store than a single large bottle, at 2.87 x 2.44 x 1.34 inches and 0.8 ounces, so it fits into a travel kit. If you want the widest possible coverage in one container, the 1.01 fl oz bottle above gives you more volume per squeeze. If you want a backup bottle, this kit is the smarter two-part buy.

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A 25% undecylenic acid liquid loaded with six botanical oils and a precision brush.

This one targets the surrounding skin as much as the nail, and that is where its owners say it shows. The formula carries 25% undecylenic acid at the extra-strength level, paired with tea tree, lavender, jojoba, clove bud, citronella, and sweet almond oils plus vitamin E. The idea is a fast-absorbing liquid that hydrates and soothes the skin sitting over and around the nail, not just the hard surface. A precision brush applies it directly and mess-free, and the bottle is compact at 0.53 ounces and 4.91 inches tall, so it fits a travel pouch.

What people appreciate most is the skin. Owners describe the appearance of the skin around the nails looking noticeably better, and some say it cleared nails that prescription lacquers did not. One experienced user makes a point worth repeating: put it on the cuticle and the nail bed, not just the flat of the nail, because a nail surface won’t absorb much on its own. With that placement, a severely damaged nail can grow out cleaner — though the same account is honest that this took over a year of daily use.

There’s a real timeline here and no way around it. Another user tried it for 29 days on a painful toenail with morning and night applications to the cuticle and under the nail bed and saw visible improvement but not a finished result, and the label itself assumes a fair amount of product over that period. Where the dropper above is a spot treatment, this one is a blend for full-nail and cuticle care, and the everyday routine it fits is brushing it on like a nail oil.