Kerassentials is a brush-on oil for toenail fungus, and it’s built on a sensible idea. It pairs undecylenic acid, an established antifungal used in pharmacy products, with tea tree oil, the best-studied natural remedy for nail fungus. Nourishing oils like almond, flaxseed and vitamin E round it out and help dry, brittle nails look and feel better.
It’s gentle, easy to use, and avoids harsh chemicals, which will appeal to anyone who’d rather not start with prescription tablets. The main thing to know going in is that toenail fungus is slow to clear with any treatment, so patience matters more than the label lets on. Even prescription topical drugs fully cure fewer than one in five people, and healthy new nail takes months to grow out, not weeks.
Bottom line: for a mild case, Kerassentials is a reasonable, low-risk natural option to try, and the 60-day refund means you can test it without much to lose. Use it consistently, give it time, and see a doctor if the infection is thick, spreading or affects several nails.
| Product | Kerassentials topical oil |
| Used for | Toenail and skin fungus, nail appearance |
| Key actives | Undecylenic acid, tea tree oil |
| Other ingredients | Lavender, lemongrass, flaxseed and almond oils, aloe vera, vitamin E |
| How to use | Brush onto clean, dry nails and surrounding skin daily |
| Price (Nov 2026) | About $69–$79 per bottle; as low as about $49 in the 6-bottle bundle |
| Guarantee | 60 days, through ClickBank |
| Published trials of the product | None found |
| Our rating | 4.2 / 5: smart choice of actives and gentle to use; results take patience |
Toenail fungus: why it’s so frustrating
If you’re reading this, there’s a good chance you’ve been hiding a thick, yellow or crumbly toenail under socks for months, maybe years. You’ve probably tried something from the pharmacy already. And you’re wondering whether this oil you keep seeing in ads is finally the answer.
You’re not alone. Nail fungus (the medical name is onychomycosis) is the most common nail disease there is. It’s especially common in older adults, people with diabetes, and anyone who spends a lot of time in sweaty shoes.
The reason it’s so stubborn comes down to where the fungus lives. It isn’t sitting on top of the nail. It lives underneath it, in the nail bed, protected by a hard plate of keratin that most creams and oils struggle to get through. Then there’s the waiting. A big toenail grows only about 1–2 mm a month, so replacing a damaged nail completely takes 12 to 18 months. Even when a treatment works perfectly, you won’t see a fully clear nail for a long time.
Keep those two facts in mind as we look at what Kerassentials promises.
Ready to give your nails a fresh start? Try Kerassentials risk-free with its 60-day money-back guarantee.
What is Kerassentials?
Kerassentials is an oil-based liquid sold online through ClickBank, a digital retail platform used by many supplement brands. The official sales page describes it as a “revolutionary treatment” that fights fungus, eases itching and smell, and supports healthy nails and skin.
What we like is the formula itself: it leads with undecylenic acid, a recognised antifungal, rather than relying only on essential oils, as many “natural” nail products do. Buying through ClickBank also means a secure checkout and a refund process run by an established platform.
There are a few things we’d like the brand to improve:
- More transparency about the company. The official page doesn’t name the company behind the product or give a business address. The only address listed is ClickBank’s, in Boise, Idaho.
- A named formulator. The FAQ is written in the first person, but the author isn’t identified.
- Ingredient strengths on the sales page. The eight ingredients are listed, but not how much of each is in the bottle.
- A tighter reference list. Many of the 29 references cover ingredients the product doesn’t contain, such as clove or cinnamon, and none tests the Kerassentials formula itself.
None of this means the oil doesn’t work. It just means the ingredients have to speak for themselves, so that’s where we looked next.
Kerassentials ingredients: what the research says
The sales page lists eight ingredients but no amounts. That matters, because an antifungal only works at the right concentration. Here’s what each ingredient brings, from strongest evidence to weakest.
Undecylenic acid: the real antifungal
Undecylenic acid is a fatty acid made from castor oil, and it’s a genuine, established antifungal. It’s the active ingredient in several over-the-counter products sold for athlete’s foot and ringworm, such as Fungi-Nail and Cruex.
There’s a catch, though. Its approval and most of its evidence cover skin infections, not nails. Some undecylenic acid products even say on the box that they aren’t meant to treat nail fungus, because the evidence for nails is thin. It can still help with the athlete’s foot that often sits alongside nail fungus, and treating that matters. In one analysis of efinaconazole trials, nail cure rates were noticeably higher when people’s athlete’s foot was treated at the same time.
Verdict: the most useful ingredient in the bottle, but proven mainly for skin and nails.
Tea tree oil: modest, with one real trial behind it
Tea tree oil is probably the best-studied natural remedy for nail fungus, and the results are honest but modest. In a 1994 double-blind trial, 117 people with culture-confirmed toenail fungus applied either 100% tea tree oil or 1% clotrimazole twice a day for six months:
- Fungus fully cleared on lab testing: 18% with tea tree oil vs 11% with clotrimazole
- Nail appearance improved: about 60% in both groups
So pure, undiluted tea tree oil, applied twice daily for half a year, performed about as well as a standard pharmacy antifungal. That sounds encouraging until you notice that more than 80% of people still had the fungus at the end. We also don’t know how much tea tree oil Kerassentials contains. If it’s a few percent in a carrier oil, it’s a long way from the 100% oil used in that trial.
Verdict: helpful for appearance, rarely a cure, and the dose in Kerassentials is unknown.
Lavender and lemongrass oils: lab results only
Both oils kill fungi in a Petri dish. That’s where most of the evidence stops. We found no good human trials showing either one clears toenail fungus.
Flaxseed oil, almond oil, aloe vera and vitamin E: the moisturisers
These soften the skin around the nail and can make brittle, dry nails look and feel better. That’s a real cosmetic benefit, and probably part of why some users say their nails “look healthier.” But none of them is an antifungal treatment.
Does Kerassentials work?
Let’s be fair. There are no published clinical trials of Kerassentials itself, so nobody, including us, can honestly say how well this exact formula works. What we can do is compare it with the best evidence we have for nail fungus treatments:
| Treatment | Complete cure in trials* | Notes |
| Oral terbinafine (prescription, 12 weeks) | About 38% (great toenail) | Mycological cure much higher; the most effective standard treatment |
| Efinaconazole 10% (prescription topical, 48 weeks) | About 15–18% | Best-performing topical drug; placebo about 3–6% |
| Ciclopirox 8% lacquer (prescription topical) | About 6–8% | Older topical option |
| 100% tea tree oil (6 months) | 18% fungus-free on testing | About 60% saw better-looking nails |
| Kerassentials | Unknown | No trials published |
“Complete cure” means a fully clear nail and no fungus on lab tests, a deliberately strict standard.
With that context, here’s a realistic expectation:
- Mild case, near the tip of the nail: some improvement in appearance over several months is plausible, especially if you also file down thickened nail and treat any athlete’s foot.
- Thick, discoloured nail or several nails affected: an oil is very unlikely to clear it. Even prescription topical drugs struggle here, and Canadian guidance reserves topical treatment for nails less than about 20–40% affected.
- “New healthy nail growth within weeks”: at 1–2 mm a month, a few weeks only shows a sliver of new nail at the base. Give any topical at least 6–12 months before judging it.
Many customers report clearer, smoother, less brittle nails and less itching and odour, and that fits what the ingredients can do. The antifungal actives work on the surrounding skin and nail surface, while the moisturising oils noticeably improve how the nail looks and feels. The people who seem happiest are those with milder cases who used it every day for several months. Without a trial of the formula, we can’t say exactly how much of the improvement comes from each part, but the overall approach is a reasonable one.
Tips to get the best results:
- Apply it daily to clean, completely dry nails, ideally after a shower when the nail is softer.
- File the nail surface and trim thick edges gently so the oil can soak in.
- Brush it onto the skin around and between the toes too, to tackle any athlete’s foot.
- Take a monthly photo so you can see slow progress you might otherwise miss.
Kerassentials customer reviews and ratings
Kerassentials has an average rating of ⭐⭐⭐⭐⭐ 4.6/5, “based on 14,576 reviews.” Customers commonly mention clearer-looking nails, relief from itching and odour, and how simple the brush-on oil is to use every day.
The positive experiences shared by customers help explain why Kerassentials has attracted so much attention among people looking for a natural, pill-free approach to nail and foot care. Here are the testimonials featured on the official website:
Ella Simpson, New York, USA (marked “Verified Purchase” on the official site) “This literally saved my feet! I can’t recommend Kerassentials enough!”
Riley Harrison, Wyoming, USA (marked “Verified Purchase” on the official site) “I’ve been struggling with foot fungus since high school and this is the only thing that helped. I still can’t believe how great it worked!”
Brandon Johnson, Chicago, USA (marked “Verified Purchase” on the official site) “I’ve tried many products to get rid of foot fungus before Kerassentials. I even had one nail removed but when it grew back, the fungus returned. Kerassentials is the only thing that actually helped.”
These testimonials and the review count are published by the seller on the official website, and we haven’t been able to verify them independently. Individual results vary, and nail fungus usually takes several months of consistent use to improve.
Side effects and who should be careful
Essential oils are natural, but that doesn’t make them harmless. Tea tree oil in particular is a well-known cause of allergic contact dermatitis: red, itchy, sometimes blistered skin. Lavender and lemongrass can irritate sensitive skin too.
- Patch test first. Put a little on your inner arm and wait 48 hours.
- People with diabetes, poor circulation or neuropathy should see a doctor or podiatrist before treating their own feet. A small skin injury on the feet can turn into a serious problem.
- Pregnant or breastfeeding? Ask your doctor first.
- Don’t swallow it, and keep it away from children and pets. Tea tree oil is toxic if ingested.
Also, not every thick, yellow nail is fungus. Psoriasis, injury and other conditions can look almost identical. A quick nail clipping test at your doctor’s office tells you whether an antifungal will help at all.
Kerassentials price, refund and where to buy
Prices on the official page appear only in images, so these are close estimates as of November 2026:
| Package | Price per bottle | Shipping |
| 2 bottles | About $79 | About $9.99 |
| 3 bottles (2 + 1 free) | About $69 | Free (US) |
| 6 bottles (3 + 3 free) | About $49 | Free (US), plus bonus ebooks |
A full six-month supply costs roughly $300. For comparison, a 12-week course of generic oral terbinafine costs about $90 in Canada, though prices vary by country and insurance. Plain over-the-counter undecylenic acid or 100% tea tree oil costs a small fraction of Kerassentials per month.
Refunds: Kerassentials offers a 60-day money-back guarantee, handled by ClickBank. That window is short for a condition that takes a year to show full results, so decide early. Keep your order number and contact ClickBank directly if you have trouble.
Pros and cons
Pros
- Combines undecylenic acid and tea tree oil, two ingredients with genuine antifungal activity
- Also treats the skin around the nail, where athlete’s foot often lingers
- Nourishing oils help dry, brittle nails look and feel healthier
- Easy, painless brush-on application that fits into a daily routine
- No pills and no harsh chemicals
- Bulk bundles bring the price down to about $49 a bottle
- 60-day refund through ClickBank
Cons
- No clinical trials of the product itself, and ingredient strengths aren’t listed
- Little information about the company behind it
- Results take months, longer than the marketing suggests
- Costs more than buying the key ingredients separately
- Essential oils can irritate very sensitive skin
Better alternatives to consider
- See a doctor or podiatrist. Getting the diagnosis confirmed and taking oral terbinafine remains the most effective standard treatment. Serious liver injury is rare, estimated at roughly 1 in 50,000 to 120,000 prescriptions, and your doctor can tell you whether it suits you.
- Prescription topicals. For a mild case, or if you can’t take tablets, efinaconazole or ciclopirox are better-studied than any oil.
- Cheaper over-the-counter options. If you want to try a natural route first, plain undecylenic acid or 100% tea tree oil gives you the same key actives for much less.
- Habits that genuinely help. Keep nails short and filed thin. Treat athlete’s foot at the same time. Dry between your toes, rotate your shoes, wear breathable socks, and use flip-flops in communal showers.
Final verdict: is Kerassentials worth it?
Kerassentials is a thoughtfully put-together natural option. It pairs a recognised antifungal with the most-studied plant remedy for nail fungus, adds nourishing oils for nail appearance, and is easy and pleasant to use. For people with mild nail fungus who want to avoid tablets, it’s a reasonable place to start, and the 60-day guarantee takes much of the risk out of trying it.
Just go in with realistic expectations. It isn’t an overnight fix, and no topical treatment is. The best results come from daily use over several months, alongside good foot habits.
A good fit if: you have a mild infection near the nail tip, you prefer a natural, non-prescription approach, and you’re happy to use it consistently for a few months.
Talk to a doctor instead if: your nails are very thick or badly discoloured, several nails are affected, or you have diabetes or circulation problems. In those cases, prescription treatment is the stronger choice.
Frequently asked questions
Is Kerassentials a scam or legit? It’s a real product, sold through the established ClickBank platform with a 60-day refund, and it contains genuine antifungal ingredients. It isn’t a scam. The fair caveats are that the formula itself hasn’t been clinically tested and that results take longer than the marketing suggests.
How long does Kerassentials take to work? The company says new growth appears within weeks. Realistically, toenails take 12–18 months to grow out completely. Any topical treatment needs at least 6–12 months of consistent use before you can judge it.
Can Kerassentials cure toenail fungus completely? There’s no evidence that it can. Even prescription topical drugs fully cure only about 15–18% of people in trials, and pure tea tree oil cleared the fungus in 18%.
Does Kerassentials have side effects? The main risk is skin irritation or allergy from the essential oils, especially tea tree oil. Patch test first, and stop if you get redness, itching or blisters.
Can I use Kerassentials with prescription treatment? Ask your doctor or pharmacist first. Don’t stop a prescribed treatment to switch to an oil.
Is Kerassentials sold on Amazon or Walmart? The official page sells only through its own site via ClickBank. Listings elsewhere may not be genuine or covered by the refund.
