A precision antifungal pen built around one idea: get the active where creams can't. The twist-pen tip delivers 25% undecylenic acid, the OTC antifungal with the strongest evidence base in its class directly along the nail edge and cuticle, the very place fungus takes hold. It works directly on skin (athlete's foot, itching, irritation between the toes) while supporting clearer-looking nail regrowth over time. Non-greasy, odourless and fully absorbed in seconds. Backed by a 90-day money-back guarantee.
Suitable for use on toenails, fingernails, and the surrounding skin, including between the toes for athlete's foot. For adult use. Visible changes tend to show over weeks; full nail regrowth follows the nail's own natural pace.
Active ingredient
Undecylenic acid 25% (OTC antifungal)
Format
Twist-pen applicator with precision tip
Volume
[ e.g. X ml ]
Pen length / diameter
[ e.g. X cm × X cm ]
Applicator material
[ e.g. brush / felt / silicone tip ]
Texture
Non-greasy, fast-absorbing, odourless
Manufacturing
[ GMP-certified — confirm before stating ]
Shelf life
[ e.g. X months from opening ]
Suitable for
Toenails, fingernails, surrounding skin · adult use
We ship across the UK by express courier, using the country's leading delivery partners. Every order is sent fully tracked and insured, door to door.
After years of trying countless treatments, this is the first one that gave me results I could actually see. What struck me most wasn't just the product, but the professionalism behind it: simple to apply, obvious quality from the first use, and well looked-after from packaging to support. Within a few weeks the improvement became impossible to ignore. If you're sceptical because you've tried other things before, I understand, I was too. One of the few purchases that genuinely exceeded my expectations.
No drips, no waste, no guesswork. One precise twist releases just enough formula to the tip so the active stays sealed and potent between uses, never drying out or leaking in your bag.
No water fillers diluting the active. Just a high-strength 25% concentration carried in a conditioning botanical base so what reaches your nail is the formula doing the work, not padding.
The tip is shaped to follow the natural curve of the nail edge and cuticle, laying down a thin, even layer exactly where it's needed clinical accuracy you can't get from a brush or a fingertip.
Produced in a GMP-certified facility under strict quality control, batch by batch. The same manufacturing discipline applies to regulated products, because everything that comes into contact with your skin every day must meet these standards.
Creams. Sprays. Oils. Perhaps even the tablets. Each one promised to be the answer. Each one left the yellow, the thickening, the crumbling. After enough of that, you stop expecting much. But the failure was never yours. Surface treatments stay on the surface and the problem was never on the surface to begin with. That single fact changes everything that follows.
The fungus lives beneath the nail, at the cuticle's edge exactly where a cream on top can never reach. Onycta™ is a precision twist-pen built for that one job: tracing 25% undecylenic acid along the nail edge in seconds. It's the OTC antifungal with the strongest evidence base in its class. On skin athlete's foot, itching it works directly. On the nail it supports clearer regrowth over weeks, not days. Badly affected? See a podiatrist we'll tell you that for free.
We're not going to ask you to believe us. You've been promised too much, too often, by too many. So here's the deal instead: try it for a full 90 days. Twice a day, a few seconds each time. Not satisfied? One email, and you're refunded in full. And one honest word nails grow slowly. Start today and summer arrives with your progress already showing. Wait for sandal weather, and you've started late.
Honest experiences from people using Onycta every day.
BUY NOW - 45% OFF TODAY
Yellowing, thickening, that crumbling edge that keeps coming back you've fought it with cream after cream, and nothing held. The reason is simple: fungus takes hold beneath the nail and along the cuticle, and a cream on top never reaches it. Our precision pen delivers 25% undecylenic acid exactly there, in seconds, twice a day. No mess, no odour, no miracle promises just an honest method and a 90-day money-back guarantee. Start today and reach summer with your progress already showing.
This category is full of products promising to "cure" fungus at the root in two weeks. We won't, because it wouldn't be true and you've heard it too many times already. Here's the honest version: nails grow slowly, so real change is measured in weeks and months, not days. On the skin, undecylenic acid works directly on athlete's foot and irritation. On the nail, it supports clearer-looking regrowth as it comes through. If a case is severe, we'll tell you to see a podiatrist even if it costs us the sale. We'd rather earn your trust than your one-time order.
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ONYCTA™
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The Honesty Others Avoid, we tell you what it can and can't do
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Precision Engineering, Not a Bottle of Hope a delivery format designed for one job
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A Concentration We Actually Print 25%, stated plainly, no "maximum strength" games
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Pharmaceutical-Grade Manufacturing quality control, batch by batch
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Real People Behind the Brand, dedicated UK support, whenever you need it
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Finding the right cushion isn’t easy, many go flat or simply don’t deliver real relief. That’s why every ONYCTA™ Cushion comes with our 90-Day Comfort Promise. Take it with you to the office, your car, or even long hours at home. If you don’t notice less pain and more comfort in your daily sitting, our team will work with you to make it right. Because when it comes to your health and comfort, we believe you should feel the difference, not just hope for it.
BUY NOW - 45% OFF
Finding the right cushion isn’t easy, many go flat or simply don’t deliver real relief. That’s why every ONYCTA™ Cushion comes with our 90-Day Comfort Promise. Take it with you to the office, your car, or even long hours at home. If you don’t notice less pain and more comfort in your daily sitting, our team will work with you to make it right. Because when it comes to your health and comfort, we believe you should feel the difference, not just hope for it.
BUY NOW - 45% OFF
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
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$29.99 $39.99
Find answers to common questions about our products, shipping, returns, and more.
We'd recommend applying the pen to a clean, bare nail and letting it absorb fully first. If you do wear polish, save the pen for evenings on a polish-free nail the active needs direct contact with the nail and surrounding skin to do its job. Polish sitting on top simply blocks it.
On intact skin and nail, most people feel nothing more than a brief, mild tingle. On cracked or broken skin you may notice a little more if it stings sharply or the area is very raw, hold off until the skin has settled, and apply to the surrounding area rather than directly into an open break.
If you're pregnant, breastfeeding, or managing diabetes, please check with your GP or pharmacist before use. This is standard for any OTC topical and for diabetics in particular, any foot or nail concern is genuinely worth having looked at by a professional, as healing can be slower and complications easier to miss.
This product is intended for adult use. We don't recommend it for children unless a GP or pharmacist has specifically advised it for your child's situation.
That depends on how many nails you're treating and how often. Treating several toenails at once will naturally use it more quickly many people treating multiple nails keep a second pen on hand to stay consistent.
The first real sign isn't the old nail clearing it's new, clearer growth coming through from the base, near the cuticle. Watch that band, not the damaged tip. Many people also notice the everyday irritation and itching settle well before the appearance changes. Taking a photo every couple of weeks makes slow progress far easier to see.
If your GP has prescribed something, follow their guidance first and ask them before adding anything. We'd never suggest replacing a treatment a professional has given you and in more advanced cases, that medical route is the right one.
Reinfection is common, so don't stop the moment things improve keep going through the full period as directed. Beyond that: dry your feet thoroughly (especially between the toes), rotate and air your shoes, avoid sharing nail clippers, and treat any athlete's foot promptly, since the skin is often where it starts.
No. The formula is non-greasy and absorbs in seconds, so once it's dried there's nothing to transfer. Just give it those few moments to dry fully before putting socks or shoes back on.
Keep it at room temperature, away from direct heat and sunlight, with the cap closed. Once opened, use it within 12 months for best results check the date on the pack. There's no need to refrigerate it.
