KeraFirm Pro Reviews: What Is Really in the Nail Fungus Liquid, and Does It Work?

What KeraFirm Pro is

KeraFirm Pro is a liquid sold in 1 oz (30 ml) bottles at kerafirmpro.com, with ClickBank processing the order, for toenail fungus. The bottle calls it a “Nail Health Formula” with “Clinically Researched Ingredients” that “Supports Strong Nails”, and names the distributor only as “Kerafirm Pro” 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, coating the nail with the brush and working it into the cuticle with a cotton swab.

The label carries the statement that the product “is not intended to diagnose, treat, cure or prevent any disease”. In other words, it is sold as a cosmetic, not as an antifungal medicine, so its claims have not been reviewed by the FDA. Its prices, shipping table and returns warehouse are the same as those of Kerassentials, another nail oil we have reviewed, and its references page even shows the label of a third product, a gut supplement, apparently left over from a shared template.

The label and the sales page do not match

The label, published on the seller’s references page, lists 9 ingredients in this order: isopropyl palmitate, undecylenic acid USP (5%), almond oil, flaxseed oil, tea tree oil, aloe vera leaf extract, DL-alpha tocopheryl acetate (vitamin E), lemongrass oil and lavender oil.

The sales page lists 13 ingredients: clove bud, lavender, manuka, flaxseed, undecylenic acid, tea tree, sweet almond, camphor, aloe vera, menthol, walnut, chia seed and vitamin E. Six of them, clove, manuka, camphor, menthol, walnut and chia oils, are not on the label, while the label’s first ingredient, isopropyl palmitate, and its lemongrass oil are not mentioned on the sales page. The label is what is in the bottle, so the clove and manuka oils that the FAQ credits with making the nail “hostile to fungus” may not be there at all.

Only undecylenic acid has an amount. Ingredients are listed from the most to the least, so isopropyl palmitate, a light moisturising ester common in cosmetics, makes up the largest part, and the essential oils at the end are likely present in small amounts.

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. KeraFirm Pro 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. KeraFirm Pro’s tea tree oil is the fifth of 9 ingredients, nowhere near full strength.
• Lemongrass and lavender oils: kill fungi in laboratory dishes, but that has not been shown to work through a toenail.
• Isopropyl palmitate, almond and flaxseed oils, aloe and vitamin E: moisturisers. They can make dry, rough nails and skin look better, but they do not kill fungus.

The seller’s references include a small 2011 case series of Vicks VapoRub, which contains menthol and camphor, and an open study of a different vitamin E nail oil with no comparison group. Neither tested KeraFirm Pro, and menthol and camphor are not on its label. 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.

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

• A sales video headlined “Top Foot Surgeon: 3-Minute Shower Hack Flushes Away Fungus In Record Time”, with no surgeon named on the page, and ratings “based on 14,263 reviews” that we could not check.
• That the formula “has been designed for all ages and medical conditions” and that “all the ingredients have been proven to be safe in clinical trials”. No such trials are cited, and essential oils such as tea tree are poisonous if swallowed and can irritate the skin.
• That it is made in an “FDA-approved facility”, next to an FDA logo in a row of badges. The FDA does not approve supplement or cosmetic factories.
• That it targets “mutated, resistant fungus” at its “source”. Drug resistance in fungi is a real problem, but nothing shows that this liquid works where medicines fail.
• That “96% of customers order 6 bottles”, crossed-out totals of $358, $537 and $1,074, and three bonus e-books with six bottles, including one promising to help you “regrow strong nails fast”.
• Two different sets of directions: four applications a day on the label and the sales page, while a help-page answer describes a single routine taking “about a minute a day” after a shower.

Side effects and who should check first

• Skin reactions: tea tree, lemongrass and lavender 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: the label says to avoid the eyes and to seek medical attention if it is swallowed. Keep it out of children’s reach.
• Tree nut allergy: the label includes almond oil.
• 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. It is a one-time payment, not a subscription, and the charge shows as CLKBANK*Kerafirm Pro. Prices were checked on the seller’s order page on 28 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 KeraFirm Pro buying guide covers the official site, international shipping and the refund steps. For other nail products we have reviewed, see our Kerassentials review and Metanail Complex review.

Realistic expectations

A liquid like KeraFirm Pro may soften dry, rough nails and the skin around them, and two of its ingredients have some antifungal activity. Nothing shows that it clears toenail fungus, and the six oils its sales page lists but its label does not are another reason for caution. 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.