Kerassentials Reviews: What Is in the Nail Fungus Oil, and Does It Work?
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Kerassentials is a nail oil sold online for toenail fungus, to be brushed on four times a day. This review covers its full 17-ingredient label, what research shows for its main ingredients, how it compares with treatments that are proven to work, the sales claims, the prices and the 60-day refund.
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Kerassentials at a Glance
Kerassentials is a 15 ml oil you brush onto your nails four times a day. Its label lists 17 ingredients, led by undecylenic acid at 5%, half the lowest strength approved for athlete’s foot and not approved for nails, plus tea tree, clove, lavender and other oils in unknown amounts. It has never been tested, and the treatments with good evidence for toenail fungus are prescription tablets and nail solutions, which take most of a year.
- Price: $49 to $79 per bottle, depending on the package
- Refund window: 60-day money-back guarantee
- Our score: 2.7/5 (Below average) · how we scored it
What Kerassentials is
Kerassentials is an oil sold in 15 ml (0.5 oz) bottles at kerassentials.com, with ClickBank processing the order, for toenail fungus. The bottle calls it a “Doctor Formulated Blend for Healthy Skin and Nails” and names the distributor only as “Kerassentials” in Aurora, Colorado, which is also the returns address. The directions are to apply it four times a day, twice in the morning and twice in the afternoon, with the brush applicator on the nail and a cotton swab around the cuticle, after filing the nail surface with an emery board.
The label carries the supplement-style statement that the product “is not intended to diagnose, treat, cure or prevent any disease”. In other words, it is sold as a cosmetic oil, not as an antifungal medicine, so its claims have not been reviewed by the FDA.
What the label shows
The label, published on the seller’s references page, lists 17 ingredients in this order: undecylenic acid USP (5%), mineral oil, sweet almond oil, organic flaxseed oil, tea tree oil, aloe vera leaf extract, canola oil, tocopheryl acetate (vitamin E), walnut oil, menthol, camphor oil, clove bud oil, jojoba oil, chia oil, lemongrass oil, lavender oil and manuka oil.
Only undecylenic acid has an amount. Ingredients are listed from the most to the least, so mineral oil and almond oil make up much of the bottle, and the essential oils further down are likely present in small amounts. The three sources also disagree: the sales page names 8 ingredients, the FAQ talks of “12 carefully selected ingredients” including clove and manuka, and the label has 17, including mineral oil and canola oil, which the sales page never mentions.
What the research shows for its ingredients
- Undecylenic acid: an approved over-the-counter antifungal for athlete’s foot, jock itch and ringworm at strengths of 10% to 25%. It is not approved for nail fungus, and drug products containing it say on the label that they are not effective on the nails. Kerassentials contains 5%. It can also cause allergic skin reactions; dermatology journals have reported allergic contact dermatitis from undecylenic acid in nail solutions.
- Tea tree oil: in a 1994 double-blind trial, people who applied 100% tea tree oil twice a day for six months did about as well as those using 1% clotrimazole: the fungus cleared on testing in 18% against 11%, and about 60% of each group saw some improvement in the nail. Kerassentials’ tea tree oil is the fifth of 17 ingredients, nowhere near full strength.
- Clove, lavender, lemongrass, manuka, menthol and camphor: these oils kill fungi in laboratory dishes, but that has not been shown to work through a toenail. In a small 2011 case series, 18 people used Vicks VapoRub, which contains menthol and camphor, on their toenails; 5 were cured after 48 weeks, with no comparison group.
- Vitamin E, flaxseed, almond, jojoba, chia, walnut, aloe, mineral and canola oils: moisturisers. They can make dry, rough nails and skin look better, but they do not kill fungus. The one clinical study of a vitamin E nail oil in the seller’s list tested a different product, with lime, oregano and tea tree oils, in an open study with no comparison group.
A 2022 systematic review of complementary treatments for nail fungus, including tea tree oil and VapoRub, found only preliminary evidence and called for proper placebo-controlled trials. Kerassentials itself has never been tested.
What works for toenail fungus
Thick, yellow or crumbly toenails are not always caused by fungus: psoriasis, injury and other conditions can look the same. A doctor or podiatrist can test a nail clipping before you start a long treatment. If it is fungus:
- Prescription tablets: a 2017 Cochrane review of 48 studies with 10,200 people found high-quality evidence that terbinafine and azole antifungals cure toenail fungus more often than a placebo, with terbinafine probably the more effective.
- Prescription nail solutions: a 2020 Cochrane review of 56 studies found high-quality evidence for efinaconazole and lower-quality evidence for tavaborole and ciclopirox, although complete cure rates were relatively low even after about a year.
- Filing and trimming: thinning the nail helps any topical treatment reach the fungus, and keeping feet dry and wearing sandals in shared showers helps prevent it coming back.
Whatever you use, toenail fungus is slow to clear, because a toenail takes a year or more to grow out. See a doctor rather than treating it yourself if you have diabetes or poor circulation, because foot infections can become serious.
What the sales pages claim
- That you will “start noticing improvements immediately” and see “new healthy pink nails growing out” within the first weeks, while the FAQ says “tests have indicated” it takes 9 to 12 weeks, without saying which tests. A damaged toenail takes a year or more to be replaced.
- A video headlined “3-Minute Shower Hack Flushes Away Fungus In Record Time”, results “based on results of over 95,000 customers” and ratings “based on 14,576 reviews”, figures we could not check, plus testimonials labelled “Verified Purchase”.
- That stopping antifungal treatment early “only makes the fungus stronger”. Drug resistance in fungi is a real and growing problem that the CDC warns about, but nothing shows that an oil blend avoids it or works where medicines fail.
- That it is “doctor formulated”, without naming the doctor, and made in a facility that is “FDA accredited”. The FDA does not accredit supplement or cosmetic factories.
- Bonus e-books with six bottles, including a “Fungal Full Detox Plan” whose “dessert recipes” are said to flush out “hidden fungal cells”, and an FAQ that recommends six bottles “just to make sure you get the full benefits”. The references page also shows the label of a second product, so expect further offers after checkout.
Side effects and who should check first
- Skin reactions: tea tree, clove, lavender and lemongrass oils and undecylenic acid can all cause irritation or allergic reactions. Stop using it if your skin becomes red, itchy or sore, as the label says.
- Do not swallow it: camphor and clove oil are poisonous if swallowed, especially for children. Keep the bottle out of their reach and away from the eyes.
- Diabetes or poor circulation: see a doctor or podiatrist about foot and nail problems instead of treating them yourself.
Price and refund
There is no single bottle. Two bottles cost $158 ($79 each) plus $9.99 shipping; three cost $207 ($69 each) and six cost $294 ($49 each), both with free US shipping, and six bottles add three e-books and a “surprise gift”. It is a one-time payment, not a subscription, and the charge shows as CLKBANK*Kerassentials. Prices were checked on the seller’s order page on 26 October 2026. The refund window is 60 days from delivery, far shorter than the time a toenail takes to grow out: email support with “Refund Request” in the subject, then send back every bottle, empty or not, to the warehouse in Aurora, Colorado, at your own cost. Our Kerassentials buying guide covers the official site, international shipping and the refund steps. For another nail product we have reviewed, see our Metanail Complex review.
Realistic expectations
An oil like Kerassentials may soften dry, rough nails and the skin around them, and a few of its ingredients have some antifungal activity. Nothing shows that it clears toenail fungus, and it cannot grow a new nail in weeks. If you want to try a topical option, give it many months, judge it on the new nail growing out at the base, and remember that the refund only lasts 60 days. If the nail is thick, painful or spreading, a doctor can confirm the diagnosis and prescribe treatments with proven results.
🧪 Key Ingredients
What is in the formula, with a short note on each ingredient:
🌿 Vitamin E
Vitamin E is a group of fat-soluble compounds, mainly alpha-tocopherol, that act as antioxidants in the body. It helps protect cell membranes from oxidative damage and is involved in immune function.
🌿 Undecylenic Acid (5%)
An approved antifungal for athlete’s foot at 10% to 25%; not approved for nails.
🌿 Tea Tree Oil
At full strength it matched clotrimazole in a 1994 trial; here it is one of 17 ingredients.
🌿 Clove, Lavender, Lemongrass and Manuka Oils
Kill fungi in laboratory dishes; not tested through the nail.
🌿 Menthol and Camphor
Ingredients of VapoRub, tried for nail fungus only in a small case series.
*Always consult with your physician before starting any new supplement.
✅ Pros
- Publishes a full ingredient list, with the strength of undecylenic acid.
- Contains tea tree oil and undecylenic acid, which have some antifungal activity.
- Easy to apply, and a one-time payment with free US shipping on three or six bottles.
❌ Cons
- Never tested, and none of its ingredients is approved for nail fungus.
- Undecylenic acid at 5%, half the lowest strength approved even for athlete’s foot.
- The sales page, FAQ and label list different ingredients (8, “12” and 17).
- Promises new healthy nails within weeks, while a toenail takes a year or more to grow out.
- Unverifiable review and customer counts, testimonials, an unnamed doctor and an “FDA accredited” facility.
- No single bottle, and a refund needs every bottle back within 60 days, at your own postage.
Choose Your Package
60-Day Money-Back Guarantee
Kerassentials comes with a 60-day money-back guarantee counted from the day your order is delivered. To claim it, email the seller’s support team with “Refund Request” in the subject line, then send back all the bottles, empty or not, with the packing slip and a note giving your name, email and order number, to the returns warehouse in Aurora, Colorado. You pay the return postage. The seller says refunds are processed a few days after the bottles arrive and take 5 to 10 days to appear on your statement. Its refund page also suggests using the product for at least three months before deciding, longer than the 60-day window. You can also ask for a refund through your ClickBank order at clkbank.com. Terms checked on the seller’s website in October 2026.
Frequently Asked Questions
Kerassentials is a 15 ml nail oil sold through ClickBank at kerassentials.com for toenail fungus. You brush it onto the nails and cuticles four times a day.
Undecylenic acid (5%), mineral oil, almond oil, flaxseed oil, tea tree oil, aloe vera, canola oil, vitamin E, walnut oil, menthol, camphor, clove bud oil, jojoba oil, chia oil, lemongrass oil, lavender oil and manuka oil. Only the undecylenic acid has an amount.
It has never been tested. Tea tree oil and undecylenic acid have antifungal activity, but at lower strengths than in the studies, and no ingredient is approved for nail fungus. Prescription tablets and nail solutions have the best evidence.
The sales page promises new nails within weeks and the FAQ says 9 to 12 weeks, but a toenail takes a year or more to grow out, even with prescription treatment.
Four times a day: brush it onto the nail, work it into the cuticle with a cotton swab, and file the nail surface first so the oil can soak in. It is for external use only.
It is for external use only. Its essential oils and undecylenic acid can irritate the skin or cause allergic reactions, and camphor and clove oil are poisonous if swallowed, so keep it away from children. People with diabetes should see a doctor about foot problems.
It is a real product sold through ClickBank with a 60-day refund and a published label. But it has never been tested, its sales page, FAQ and label list different ingredients, and its promise of new nails within weeks does not fit how nails grow.
Two bottles cost $158 plus $9.99 shipping, three cost $207 and six cost $294, with free US shipping. It is a one-time payment, and the charge shows as CLKBANK*Kerassentials.
You have 60 days from delivery. Email support with “Refund Request” in the subject line, then send every bottle back, empty or not, with the packing slip to the warehouse in Aurora, Colorado, at your own cost. ClickBank’s order support at clkbank.com can also help.
The seller says it is sold only on its own website, and its affiliate terms do not allow listings on Amazon, eBay or other retail sites, so a bottle from there is not covered by the refund.
🎉 Special Offer Available
For a limited time, get the 6 Bottles for just $294 ($49/bottle).
180 Day Supply
See Why Everyone's Choosing This →How we scored Kerassentials
Five weighted criteria — see our full methodology.
Whether the label discloses how much of each ingredient it contains, rather than hiding amounts inside a proprietary blend.
Whether the finished product has been tested in a published trial, or the claims rest on research into individual ingredients.
Monthly cost on the three-month package, the shortest course most vendors recommend (the single price for one-off digital products), compared against the rest of the category.
Length of the refund window measured against the trial period the vendor itself recommends.
How the product is sold: sales channel, checkout upsells, subscription defaults and how clearly the offer is presented.
Transparency: the label lists all 17 ingredients in order and gives the strength of undecylenic acid (5%), but no other amounts, and the sales page, the FAQ and the label name different sets of ingredients (8, “12” and 17). Evidence: the oil itself has never been tested; tea tree oil did about as well as clotrimazole cream in one 1994 trial at full strength, far more than here, and undecylenic acid is approved only for athlete’s foot and ringworm, at twice this strength. Buying practices: promises of new healthy nails within weeks when a toenail takes a year or more to grow out, “14,576 reviews” and “95,000 customers” that cannot be checked, testimonials, an unnamed doctor, an “FDA accredited” facility, and a refund that needs every bottle back within 60 days.
Final Verdict
Kerassentials is a pleasant-sounding blend of oils, and two of its ingredients, tea tree oil and undecylenic acid, do have antifungal activity. But the oil itself has never been tested, the undecylenic acid is at half the lowest strength approved even for athlete’s foot, and the tea tree oil is one of 17 ingredients, far from the full-strength oil that matched an antifungal cream in a 1994 trial. Its moisturising oils may make dry, rough nails look better, which is not the same as clearing the fungus.
The bigger problem is the timescale. The sales page promises new healthy nails within weeks, but a toenail takes a year or more to grow out, and the refund window closes after 60 days. If you have thick, discoloured toenails, ask a doctor or podiatrist to confirm it is fungus first; if it is, prescription tablets such as terbinafine and nail solutions such as efinaconazole have the best evidence. If you have diabetes or poor circulation, do not treat foot problems on your own.
Why Trust This Review?
We check claims against published research and score every product with the same published rubric. We earn a commission if you buy through our links (disclosure); it never changes a score.
- ✓ Scored with our published rubric
- ✓ Claims checked against published research
- ✓ Refund terms checked
- ✓ Affiliate commissions disclosed
Thinking of Trying Kerassentials?
Order only from the official site, so the 60-day money-back guarantee applies, and check the total price and refund terms before you pay.
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