Kerassentials is a nail oil built on ingredients with real antifungal activity in the lab: undecylenic acid, tea tree, lavender and lemongrass oils. It is simple to use, the label is printed on the official site, and the guarantee covers empty bottles. What holds it back is the evidence: none of these ingredients is proven to clear an established toenail infection, the oils are diluted in a cosmetic base, and the sales page promises fast, dramatic results that nail fungus rarely allows. It fits best as a gentle option for mild nail changes after a doctor has confirmed the cause.
What we like
- Full ingredient label shown on the official site
- Contains undecylenic acid and tea tree oil, both antifungal
- One-time payment, no subscription
- 60-day guarantee, even for empty bottles
Keep in mind
- No trial of the finished product
- Four applications a day, for months
- "Shower hack flushes away fungus" marketing is overstated
- Email-only support; you pay return shipping
Check Kerassentials price on the official site →Opens the brand's official website · money-back guarantee
The bottle says Kerassentials, a "doctor formulated blend for healthy skin and nails". It is an oil you apply, not a capsule.
Kerassentials is a topical oil for nails and the skin around them, sold mainly to people dealing with toenail fungus. Each 15 ml bottle comes with a brush applicator. The current label lists undecylenic acid (5%), tea tree oil, lavender oil, lemongrass oil, almond oil, flaxseed oil, aloe vera and vitamin E in a cosmetic base. You paint it on four times a day. It is sold through thekerassentials.com at $49 to $79 per bottle as a one-time payment, with a 60-day money-back guarantee. This review covers what each ingredient can realistically do, the price, the refund terms and who should see a doctor first.
First, a word about nail fungus
Thick, yellow, crumbly toenails are often caused by a fungal infection, but not always. Psoriasis, injury from tight shoes and other skin conditions can look very similar, and a fungus treatment will not help those. A doctor or podiatrist can confirm a fungal infection by examining a small clipping of the nail.
Nail fungus is also notoriously slow and stubborn, even with prescription medicine, because the infection sits under a hard nail plate and a healthy toenail takes many months to grow out. See a doctor promptly if you have diabetes or poor circulation, if the skin around the nail becomes red, swollen, hot or painful, or if the nail is lifting off. Kerassentials is a cosmetic nail and skin oil, not an approved treatment for nail fungus.
What is inside Kerassentials?
The text version of the order page lists eight key ingredients, and the label image matches them. Here they are next to what the research actually supports.
| Ingredient | What the brand says | What research supports |
|---|---|---|
| Undecylenic acid (5%) | Helps prevent fungus and protect the nails | A fatty acid used as the active ingredient in some over-the-counter athlete's foot products. Good lab activity against fungi; little evidence that it gets through a thick infected nail. |
| Tea tree oil | Strong antifungal, curbs fungus growth | The best-studied oil here. A small 1990s trial of pure tea tree oil on toenail fungus gave results similar to a clotrimazole solution, with low full-cure rates for both. The oil in Kerassentials is diluted. |
| Lavender oil | Protects nail keratin, fights fungus | Antifungal activity in lab dishes; no trials on nail fungus in people. |
| Lemongrass oil | Antifungal, prevents future infection | Lab studies only for fungi. Can irritate skin in some people. |
| Almond oil, flaxseed oil | Skin immunity, nail support | Carrier oils that soften and moisturize skin and cuticles. No antifungal evidence in people. |
| Aloe vera leaf extract | Soothes and moisturizes skin | Reasonable as a skin soother; not shown to treat nail fungus. |
| Vitamin E (tocopheryl acetate) | Protects the skin | A common skin conditioner. An open study of a vitamin E and essential-oil nail oil (cited by the brand) reported improvement in mild cases, without a control group. |
| Isopropyl palmitate | (not described) | A cosmetic base that helps the oil spread and absorb. It is the first ingredient on the current label. |
One thing to know: the references page shows an older label with a longer formula, including mineral oil, canola, walnut, menthol, camphor, clove, jojoba, chia and manuka oils, and the contact page still describes clove and manuka oil. The bottle shown on the order page uses the shorter formula above. Check the label on your bottle when it arrives, especially if you have a nut allergy.
Unlike most supplements, this label does give one amount: undecylenic acid at 5%. The essential oils have no stated percentages. Because ingredients on cosmetic labels are generally listed from most to least, the tea tree, lemongrass and lavender oils come after the carrier oils, which suggests they are a modest part of the mix.
Every ingredient, up close
Here is every active ingredient on the label, what it actually is, and what research does and does not show.
Isopropyl palmitate
No percentage given (listed first on the current label)A synthetic ester made from isopropyl alcohol and palmitic acid, used in lotions and nail oils as a light base that helps the other ingredients spread and soak in. Being first on the label suggests it makes up the largest share of the bottle. It is not an antifungal and the brand does not describe it at all.
Undecylenic acid
USP, 5%A fatty acid originally derived from castor oil that has been used for decades as the active ingredient in over-the-counter athlete's foot and skin fungus products. It works on the skin surface and kills fungi well in the lab. The open question for toenails is penetration: we found no good trial showing that a 5% oil gets through a thick infected nail and clears it.
Sweet almond oil
No percentage givenOil pressed from sweet almonds, a classic carrier and moisturizer in skin care. It softens dry cuticles and can make nails look healthier, but it has no antifungal evidence in people. It is a tree-nut ingredient, which matters if you have a nut allergy.
Photo: Ivar Leidus / CC BY-SA 4.0, via Wikimedia Commons
Flaxseed oil
No percentage givenOil from the seeds of the flax plant (Linum usitatissimum), rich in the omega-3 fat ALA. On the skin it acts as an emollient; there are no studies of flaxseed oil against nail fungus.
Photo: Sanjay Acharya / CC BY-SA 3.0, via Wikimedia Commons
Tea tree oil
No percentage givenAn essential oil distilled from the leaves of the Australian Melaleuca alternifolia tree, and the best-studied oil in this bottle. A small 1990s trial of undiluted tea tree oil on toenail fungus did about as well as a clotrimazole solution, but full cures were uncommon in both groups, and NCCIH calls the evidence for nail fungus limited. Here it is diluted and listed after the carrier oils, so expectations should be lower still.
Photo: Geoff Derrin / CC BY-SA 4.0, via Wikimedia Commons
Aloe vera leaf extract
No percentage givenThe gel-filled leaf of Aloe barbadensis, used for generations to soothe skin. It is reasonable as a moisturizer around the nail, but it has not been shown to treat nail fungus.
Photo: Ellywa / CC BY-SA 4.0, via Wikimedia Commons
Vitamin E (tocopheryl acetate)
No percentage givenA stable form of vitamin E used as a skin conditioner and to keep oils from going rancid (pictured: almonds, a common food source of vitamin E). The brand cites an open study of a vitamin E and essential-oil nail oil that reported improvement in mild to moderate cases, but with no comparison group it is hard to say how much was the oil and how much was time and nail care.
Photo: Ivar Leidus / CC BY-SA 4.0, via Wikimedia Commons
Lemongrass oil
No percentage givenAn essential oil from the grassy stalks of Cymbopogon citratus. Its antifungal activity has only been shown in lab studies, not on nails in people, and it can irritate sensitive skin.
Photo: Obsidian Soul / CC0, via Wikimedia Commons
Lavender oil
No percentage given (last on the label)Distilled from the flowers of Lavandula angustifolia. It shows antifungal effects in lab dishes, but there are no trials on nail fungus in people, and as the last ingredient it is likely present in a small amount. Like the other essential oils, it can cause contact dermatitis in some people.
Photo: Emőke Dénes / CC BY-SA 4.0, via Wikimedia CommonsWhy nail fungus is so hard to treat
Toenail fungus lives in and under the nail plate, a dense layer of keratin that keeps most creams and oils from reaching it. Even prescription topical treatments for nails have modest cure rates, and oral prescription pills work better but are not right for everyone. On top of that, a big toenail can take a year or more to grow out completely, so even a treatment that stops the fungus will take many months to show a clear nail.
The Kerassentials sales page presents a "3-minute shower hack" that "flushes away fungus in record time". Applying an oil after a shower, when nails are softer, is sensible. But "record time" is not how nail fungus behaves, and the brand's own FAQ talks about 9 to 12 weeks for results.
Check Kerassentials price on the official site →Opens the brand's official website · money-back guarantee
How to use Kerassentials
The label says to shake the bottle and apply it four times a day: twice in the morning and twice in the afternoon. Use the brush to coat the whole nail, then a cotton swab to work the oil into the cuticle and the skin under the nail edge. Gently filing the nail surface with an emery board helps it absorb. Keep nails trimmed short, dry your feet well and wear breathable socks and shoes, since moisture helps fungus grow. Stop if your skin becomes red, itchy or blistered. Do not swallow it, and keep it away from your eyes.
How much does Kerassentials cost?
The official order page sells three packages. Each bottle is described as a 30-day supply. The FAQ states it is a one-time payment with no recurring shipments.
2 bottles60-day supply$79 /bottle$158 · + $9.99 shippingCheck availability →Best value
6 bottles180-day supply$49 /bottle$294 · free US shipping + 3 e-booksCheck availability →
3 bottles90-day supply$69 /bottle$207 · free US shippingCheck availability →| Package | Supply | Price per bottle | Total | Extras |
|---|---|---|---|---|
| 2 bottles | 60-day supply | $79 | $158 | + $9.99 shipping |
| 6 bottles | 180-day supply | $49 | $294 | free US shipping + 3 e-books |
| 3 bottles | 90-day supply | $69 | $207 | free US shipping |
Prices as listed on the official order page when we checked. They change from time to time, so the checkout page is the final word.
About shipping: the 2-bottle package shows $9.99 shipping, while 3 and 6 bottles ship free in the US. The shipping page lists 5 to 7 working days in the US and $15.95 with 10 to 15 working days for Canada, the UK, Ireland, Australia and New Zealand. The 6-bottle package adds three e-books (Skin SOS, Barefoot Ready and The Fungal Full Detox Plan) and a "surprise gift". Some package images on the page also show a jar of a different supplement marked free; the page text does not mention it, so do not count on it. Check the total on the checkout page before paying.
How the 60-day guarantee works
Every order from the official Kerassentials store is covered by a 60-day money-back guarantee, and it is a one-time payment with no subscription or auto-shipment.
You have 60 days from the day your package is delivered. Email contact@kerassentials-product.com with "Refund Request" in the subject line, then send all the bottles back, opened or empty, with a note showing your name, email and order number, to 19655 E 35th Dr #100, Aurora, CO 80011, USA. The refund page says refunds are processed within a few days of the package arriving, and take 5 to 10 days to show on your card. Two things to know:
- You pay return shipping. The page states the company does not cover it.
- Support is by email only. We found no customer service phone number on the site, so keep your order email and act well before day 60.
Who should talk to a doctor before using Kerassentials?
- People with diabetes, poor circulation or numb feet: a foot or nail infection can become serious, and you may not feel a problem developing. See a doctor or podiatrist rather than treating it yourself.
- Anyone with a weakened immune system, from illness or medicines such as chemotherapy, steroids or transplant drugs.
- People with nut allergies: the formula contains sweet almond oil, and an older version of the label also listed walnut oil.
- People with sensitive skin or eczema around the nails: tea tree, lemongrass and lavender oils can cause irritation or allergic contact dermatitis. Test a small area first.
- Children, and pregnant or breastfeeding women: ask a doctor first; the label says to keep it away from children and not to swallow it.
The most likely side effects of an oil like this are skin redness, itching or a rash around the nail, usually from the essential oils. Wash it off and stop using it if that happens.
What to realistically expect
If Kerassentials helps you, it will be gradual. In the first weeks you may notice softer cuticles and nails that look less dry, mostly thanks to the oils. Any real change in a fungal nail shows up as clearer nail growing in from the base, which takes months. A fair approach is to get the diagnosis confirmed, photograph your nails on day one, apply the oil as directed for eight weeks and compare. If you see no clear new growth, or the infection spreads, talk to a doctor about prescription options. Decide before day 60 after delivery so you can still use the guarantee.
Our verdict
Kerassentials is an honest-looking product wrapped in overexcited marketing. The label is public, it contains two ingredients with genuine antifungal activity, and the guarantee is generous on paper. But nail fungus is one of the hardest skin infections to clear, the oils are diluted, and there is no trial of the product itself. If you have mild nail changes, a confirmed diagnosis and patience for a four-times-a-day routine, it is a reasonable thing to try from the official site with the refund as a backup. If you have diabetes or a painful, spreading infection, start with a doctor.
Check Kerassentials price on the official site →Opens the brand's official website · money-back guarantee
Your doubts, answered honestly
Is this a scam?
Here is what we could verify: the full ingredient label is published on the official site, the refund policy is written out, and there is a physical returns address in Aurora, Colorado. What we could not verify: any clinical trial of Kerassentials itself, and a phone line (support is by email only). The product is real; the problem is a sales page that promises far faster results than nail fungus allows.
Why does it cost $49 to $79 a bottle?
Each 15 ml bottle is sold as a 30-day supply, so you are paying somewhere between about a dollar and a half and a bit over two and a half dollars a day, depending on the package. That is a lot for a short list of common oils. Plain undecylenic acid and tea tree oil products sold for athlete's foot are usually much cheaper; what you pay extra for here is the combined formula, the brush bottle and the guarantee.
Will it work for me?
Be realistic. None of these ingredients is proven to clear an established toenail infection, and the finished product has never been tested in a trial. The most likely early change is softer, less dry cuticles. If anything happens to the fungus, it shows up as clear nail growing in from the base, which takes months. People with thick, crumbly nails covering most of the nail plate are the least likely to see a difference from any topical oil.
Is it safe? Can I use it with my medication?
It is applied to the skin, not swallowed, so drug interactions are not the main concern. The real risks are skin irritation or allergy from the essential oils and a tree-nut reaction from the almond oil. If you have diabetes, poor circulation, numb feet or a weakened immune system, see a doctor instead of treating a nail problem yourself.
What if it does not work?
You have 60 days from delivery. Email the company with "Refund Request" in the subject line, then send all bottles back, even empty ones, to the Aurora, Colorado address. You pay the return shipping, and the refund takes a few days to process plus 5 to 10 days to reach your card. Since nails change slowly, take a photo on day one and make your call well before day 60.
Why not just buy it on Amazon or another store?
The guarantee described in this review applies to orders from the official store. We cannot vouch for listings on other marketplaces, and a bottle bought from a third-party seller would not be covered by that refund policy.
Do you get paid if I buy?
Yes. If you order through our buttons, we may earn a commission. It does not change the price you pay or what we write, and the buttons simply take you to the brand's own order page.
Frequently asked questions
What are the ingredients in Kerassentials?
The current label lists isopropyl palmitate, undecylenic acid USP (5%), almond oil, flaxseed oil, tea tree oil, aloe vera leaf extract, vitamin E (DL-alpha tocopherol acetate), lemongrass oil and lavender oil. An older label on the references page lists a longer formula with mineral oil, canola, walnut, menthol, camphor, clove, jojoba, chia and manuka oils.
How do you use Kerassentials?
The label says to shake the bottle and apply it four times a day, twice in the morning and twice in the afternoon, using the brush to coat the nail and a cotton swab to work it into the cuticle. Gently filing the nail surface first helps the oil soak in.
Is Kerassentials taken by mouth?
No. It is for external use only. The label warns not to swallow it and to get medical help if someone does.
How much does Kerassentials cost?
2 bottles for $158 plus $9.99 shipping, 3 bottles for $207 or 6 bottles for $294, both with free US shipping. The 6-bottle package adds three e-books.
How long does Kerassentials take to work?
The brand's FAQ says around 9 to 12 weeks. Toenails grow slowly, so a fully clear nail usually takes far longer than that with any treatment.
Who pays return shipping on Kerassentials?
The customer. The refund page says to send all bottles back, empty or not, and that the company does not cover return shipping costs.
Related reading
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Buy it from the official store so the guarantee applies, and keep your order email until you decide.
Check Kerassentials price on the official site →Opens the brand's official website · money-back guaranteeSources
- Kerassentials official order page, text presentation, contact/FAQ page, references page with label image, refund page and shipping page (thekerassentials.com), accessed October 2026
- MedlinePlus: Fungal nail infection. medlineplus.gov
- NCCIH: Tea Tree Oil. nccih.nih.gov/health/tea-tree-oil
- NCCIH: Lavender. nccih.nih.gov/health/lavender
- MedlinePlus: Nail Diseases. medlineplus.gov/naildiseases.html
- MedlinePlus: Athlete's Foot. medlineplus.gov/athletesfoot.html
- Alessandrini A, et al. An open study to evaluate effectiveness and tolerability of a nail oil composed of vitamin E and essential oils in mild to moderate distal subungual onychomycosis. Skin Appendage Disorders, 2020 (cited on the official site).