MycosynX is a straightforward topical: a small bottle of oil-based serum built around undecylenic acid, a well-known antifungal ingredient, with tea tree and other plant oils. It suits adults who want a consistent at-home nail-care routine and are willing to apply it several times a day for weeks. It is not a cure for nail fungus, and thick, discolored or painful nails, especially with diabetes, should be checked by a doctor or podiatrist first.
What we like
- Applied directly to the nail, nothing to swallow
- Label states the active percentage: undecylenic acid USP 5%
- One-time payment and 60-day money-back guarantee
- Short list of familiar oils and aloe
Keep in mind
- Needs 4 applications a day to follow the label
- Customer pays return shipping
- Almond oil and essential oils may not suit people with nut allergy or sensitive skin
Check MycosynX price on the official site →Opens the brand's official website · money-back guarantee
MycosynX is a topical nail serum, not something you take by mouth. The current bottle is a 0.5 oz (15 ml) "Fungal Nails Serum" whose label lists undecylenic acid USP at 5% alongside tea tree, almond, flaxseed, lemongrass and lavender oils, aloe vera and vitamin E. The directions call for applying it 4 times a day to the nail and cuticle. It sells on mycosynx.com for $49 to $79 per bottle, charged once, with a 60-day money-back guarantee. Below: the label, how to use it, the price, the refund, and the name mix-up that sends many shoppers to the wrong product.
What exactly is MycosynX?
The official order page describes MycosynX as "Healthy skin & nails, naturally", a product to "support your body's natural microbial balance". It is aimed at people bothered by yellow, thick or rough-looking toenails and fingernails and by foot-skin problems. The bottle says "For external use only" and "do not ingest". There is no nutrition-style panel because it is a cosmetic-style serum you apply, and you should think of it the way you would think of a nail oil or foot cream.
Is it the same as Mycosyn Pro?
No, and this confusion is worth a moment. If you search for "MycosynX" or "mycosyn", many results point to Mycosyn Pro, a different and older product that is taken by mouth and sold through a crowd of look-alike "official" sites (en-mycosynpro.com, en-us-mycosynpro.com, mycosynpro-us.com, mycosynpromycosyn.com) and spam review pages. It has nothing to do with this serum.
The quick way to tell them apart: MycosynX is applied to the nail and sold on mycosynx.com. If a page tells you to swallow something, shows a different bottle or sends you to a domain containing "mycosynpro", you are looking at the other product.
What does the MycosynX label say?
We used the label shown on the official order page (revision REV 0524), which matches the bottle in the product photos. Ingredients, in label order:
- Isopropyl palmitate (a light carrier that helps the serum spread)
- Undecylenic acid USP (5%)
- Almond oil (Prunus amygdalus dulcis)
- Flaxseed oil (Linum usitatissimum)
- Tea tree essential oil (Melaleuca alternifolia)
- Aloe vera leaf extract (Aloe barbadensis)
- DL-alpha tocopherol acetate (vitamin E) oil
- Lemongrass oil (Cymbopogon citratus)
- Lavender oil (Lavandula angustifolia)
| Ingredient | Amount on the label | What research supports |
|---|---|---|
| Undecylenic acid USP | 5% | An established topical antifungal listed in the FDA's over-the-counter monograph for athlete's foot and ringworm; topical products in general penetrate the nail plate poorly. |
| Tea tree essential oil | Not listed | NCCIH: a small amount of evidence for athlete's foot; for nail fungus "the amount and the quality of the research are insufficient". |
| Isopropyl palmitate | Not listed | A carrier that helps the serum spread; not an antifungal. |
| Almond oil, flaxseed oil, aloe vera, vitamin E oil | Not listed | Conditioning ingredients for the skin around the nail; no evidence against nail fungus. |
| Lemongrass oil, lavender oil | Not listed | Mainly fragrance; lavender has no good evidence for nail fungus, and NCCIH notes topical lavender can irritate skin. |
The label names the distributor as MycosynX, 11870 62nd St N, Largo, FL 33773, and says "Assembled in the USA".
A heads-up about the older spray. The mycosynx.com homepage still shows an earlier product, a 1 oz "Fungus Spray" with a different formula: mineral oil, undecylenic acid (no percentage given), clove, walnut, camphor, menthol, jojoba, chia and other oils, applied once a day. The "8 ingredients" the homepage highlights, such as camphor, menthol, jojoba and chia, belong to that spray, not the serum. The homepage also slips once and describes the product with the wrong format word. The serum label above is the one that matches the order page, so trust it and read the box that arrives.
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
Carrier, no percentage given (first on the label)A synthetic ester of isopropyl alcohol and palmitic acid that cosmetic makers use as a light, non-greasy base. It helps the serum spread over the nail and cuticle. Listed first, it is probably the biggest part of the bottle, and it has no antifungal role.
Undecylenic acid USP
5%A fatty acid made from castor oil and the one ingredient here with regulatory standing: it appears in the FDA's over-the-counter monograph for athlete's foot and ringworm. The catch is the nail itself. Topical products in general penetrate the nail plate poorly, and we found no trial showing that a 5% serum clears nail fungus. The MycosynX label is not a "Drug Facts" panel, and we could not verify its regulatory status.
Almond oil (Prunus amygdalus dulcis)
No percentage givenOil pressed from sweet almonds, used to soften skin and cuticles. It conditions the area around the nail but has no evidence against fungus. People with a tree-nut allergy should skip it or patch-test first.
Photo: Ivar Leidus / CC BY-SA 4.0, via Wikimedia Commons
Flaxseed oil (Linum usitatissimum)
No percentage givenOil from flax seeds, high in the omega-3 fat ALA. It works as an emollient on the skin; it has not been studied for nail fungus.
Photo: Sanjay Acharya / CC BY-SA 3.0, via Wikimedia Commons
Tea tree essential oil (Melaleuca alternifolia)
No percentage givenDistilled from the leaves of an Australian tree and the best-known "natural" antifungal oil. NCCIH says there is a small amount of evidence for athlete's foot, possibly weaker than standard treatment, and that for nail fungus "the amount and the quality of the research are insufficient". Its concentration in the serum is not stated.
Photo: Geoff Derrin / CC BY-SA 4.0, via Wikimedia Commons
Aloe vera leaf extract (Aloe barbadensis)
No percentage givenExtract of the gel-filled aloe leaf, a long-standing skin soother. It keeps the cuticle area comfortable; it is not an antifungal.
Photo: Ellywa / CC BY-SA 4.0, via Wikimedia Commons
DL-alpha tocopherol acetate (vitamin E) oil
No percentage givenA stable synthetic form of vitamin E used to condition skin and protect the oils from oxidation (pictured: almonds, a common food source of vitamin E). There is no evidence that vitamin E on its own does anything against nail fungus.
Photo: Ivar Leidus / CC BY-SA 4.0, via Wikimedia Commons
Lemongrass oil (Cymbopogon citratus)
No percentage givenAn essential oil from the stalks of lemongrass. In this serum it mainly adds fragrance; its antifungal activity has been seen in lab dishes, not in nail studies, and it can irritate sensitive skin.
Photo: Obsidian Soul / CC0, via Wikimedia Commons
Lavender oil (Lavandula angustifolia)
No percentage given (last on the label)Distilled from lavender flowers and listed last, so likely a small amount. There is no good evidence for lavender in nail fungus, and NCCIH notes that topical lavender can irritate the skin.
Photo: Emőke Dénes / CC BY-SA 4.0, via Wikimedia CommonsCheck MycosynX price on the official site →Opens the brand's official website · money-back guarantee
How do you apply MycosynX?
The label routine is more involved than a once-a-day product, so it helps to plan it:
- Four times a day: twice in the morning and twice in the afternoon.
- Use the brush applicator on the nail surface and a cotton swab to work it into the cuticle.
- The label suggests gently filing the nail with an emery board.
- Keep it away from your eyes and mouth. If it is swallowed, drink water and seek medical attention. Stop if irritation occurs.
One small inconsistency: the label mentions a brush applicator, but the product photos show a pump top. We could not confirm which one ships, so check your bottle. Nails grow slowly, so any change in how they look takes months, not days.
How much does MycosynX cost?
2 bottles60-day supply$79 /bottle$158 · + shippingCheck availability →Best value
6 bottles180-day supply$49 /bottle$294 · free shipping + bonusesCheck availability →
3 bottles90-day supply$69 /bottle$207 · + shippingCheck availability →| Package | Supply | Price per bottle | Total | Shipping |
|---|---|---|---|---|
| 2 bottles | 60 days | $79 | $158 | + shipping |
| 3 bottles | 90 days | $69 | $207 | + shipping |
| 6 bottles | 180 days | $49 | $294 | free shipping + bonuses |
Prices as listed on the official order page when we checked. They change from time to time, so the order page is the final word.
Each package is a one-time charge; the brand's FAQ says there are no auto-shipments or subscriptions. The 6-bottle package ships free in the US and adds two digital guides (foot care and skin care). The order page shows "+ shipping" on the 2- and 3-bottle packages, while the support page says 3 and 6 bottles ship free and lists $9.99 domestic and $19.90 international. The checkout page shows the final amount, so confirm it there. The homepage lists 3 bottles at $177, a different offer from the order page.
How does the 60-day guarantee work?
Every order from the official MycosynX store is covered by a 60-day money-back guarantee, and it is a one-time payment with no subscription.
You have 60 days from the order date. The order page promises that if you "send back any remaining bottles (even empty ones)" you get every penny back, and the support page asks for all bottles, "empty, full or partially full". Two costs to plan for: you pay return shipping, per the support page. Refunds arrive 5 to 10 business days after processing according to support, or 3 to 5 according to the terms.
Contact support first (support@mycosynx.com on the order page, support@healthyconsumer.us on the support page, phone +1 (877) 257-0825), then ship to MycosynX, 11870 62nd St N, Largo, FL 33773, USA.
Who should see a doctor or podiatrist first?
Thick, discolored nails are not always fungus. Psoriasis, injury and, rarely, melanoma can look similar, and a proper diagnosis needs a test. The American Academy of Dermatology explains the options on its nail fungus page. Get checked before relying on any at-home product if:
- you have diabetes or poor circulation (the NIDDK advises close attention to any foot or nail problem);
- the nail hurts, the discoloration is spreading, or there is swelling, redness or pus;
- a dark streak appears under the nail.
Also skip it or patch-test first if you have a tree-nut allergy (it contains almond oil) or sensitive skin: tea tree, lemongrass and lavender oils can cause contact dermatitis, and an allergic reaction to an undecylenic nail solution has been reported.
Tips for sticking with a four-times-a-day routine
The biggest practical hurdle with MycosynX is simply remembering to use it. Some ideas that make the label schedule easier: keep one bottle where you get ready in the morning and apply twice there, a few minutes apart; set two afternoon reminders on your phone; apply to clean, dry nails so the serum is not wiped straight off; and give it a moment to absorb before putting on socks. Wash your hands after applying, and use a fresh cotton swab each time on the cuticle. Take a dated photo of the nail every couple of weeks so you can judge honestly, since nails grow slowly and daily changes are hard to see. If irritation, redness or pain appears, stop and ask a professional.
Our verdict
MycosynX is a clear, simple nail serum: a stated 5% undecylenic acid, well-known plant oils, a one-time price and 60 days to change your mind. It rewards people who stick to a four-times-a-day routine and have realistic expectations about how slowly nails change. Make sure you are ordering the serum on mycosynx.com, not Mycosyn Pro, and get a diagnosis first if your nails hurt or you have diabetes.
Check MycosynX price on the official site →Opens the brand's official website · money-back guarantee
Your doubts, answered honestly
Is this a scam?
The serum itself is a real, simple product: the label is published on the order page, it states a 5% undecylenic acid, and it names a distributor in Largo, Florida, with a phone number and a written 60-day guarantee. The confusing part is the internet around it. Mycosyn Pro, a different capsule product, is sold on many look-alike domains, and the mycosynx.com homepage still shows an older spray formula. Order the serum from mycosynx.com and read the label on the box that arrives.
Why does it cost $49 to $79 a bottle?
A bottle is a 30-day supply, so the cost works out to roughly a dollar and a half to two and a half dollars a day, depending on the package. For a 15 ml bottle of common oils, that is expensive. Over-the-counter undecylenic acid and tea tree products for athlete's foot are usually much cheaper; the premium here buys the combined formula, the applicator and the refund window.
Will it work for me?
MycosynX is not presented or proven as a cure, and the product itself has no clinical trial. What you can reasonably expect from following the label is softer, better-kept cuticles and nails. Any real change in a fungal nail shows up as clear growth from the base over months. Thick, painful nails, or nails that may not be fungus at all, are the cases where an at-home serum is least likely to help.
Is it safe? Can I use it with my medication?
It goes on the skin, not in the mouth, so it is not expected to interact with pills. The realistic risks are contact dermatitis from tea tree, lemongrass or lavender oil, a reaction to almond oil in people with tree-nut allergy, and, rarely, allergy to undecylenic nail solutions. If you have diabetes or poor circulation, or the nail hurts or has a dark streak, see a doctor or podiatrist first.
What if it does not work?
You have 60 days from the order date, not from delivery. Contact support first, then ship all bottles, empty, full or partly used, to the Largo, Florida address. You pay return shipping. Support says refunds land 5 to 10 business days after processing; the terms say 3 to 5.
Why not just buy it on Amazon or another store?
Because of the name confusion, other stores are where people most often end up with Mycosyn Pro or another product. The guarantee in this review covers orders from the official store, and a bottle bought elsewhere would not be covered by it.
Do you get paid if I buy?
Yes. If you order through our buttons, we may earn a commission. It does not change your price or our opinion, and the buttons go straight to the brand's own order page.
Frequently asked questions
Is MycosynX taken by mouth?
No. MycosynX is a topical serum applied to the nails and cuticles. The label says it is for external use only and must not be ingested.
What is the active ingredient in MycosynX?
The serum label lists undecylenic acid USP at 5%, with tea tree, almond, flaxseed, lemongrass and lavender oils, aloe vera and vitamin E.
How often do you apply MycosynX?
The label says 4 times daily, twice in the morning and twice in the afternoon, using the brush on the nail and a cotton swab on the cuticle.
Is MycosynX the same as Mycosyn Pro?
No. Mycosyn Pro is a different, older product taken by mouth and sold on other domains. MycosynX is a nail serum sold on mycosynx.com.
Does MycosynX cure nail fungus?
It is not presented or proven as a cure. Nail problems that spread, hurt or occur with diabetes should be diagnosed by a doctor or podiatrist.
Who pays return shipping on MycosynX?
The customer, according to the support page. The guarantee covers 60 days from the order date.
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Buy it from the official store so the guarantee applies, and keep your order email until you decide.
Check MycosynX price on the official site →Opens the brand's official website · money-back guaranteeSources
- MycosynX official order page, product label (REV 0524), homepage (mycosynx.com), support page and terms, accessed September 2026
- NCCIH: Tea Tree Oil. nccih.nih.gov/health/tea-tree-oil
- NCCIH: Lavender. nccih.nih.gov/health/lavender
- Ex vivo comparison of prescription and over-the-counter nail antifungals, 2024 (PubMed). pubmed.ncbi.nlm.nih.gov/39133361
- Allergic contact dermatitis from an undecylenic acid nail solution (PubMed). pubmed.ncbi.nlm.nih.gov/30537336
- American Academy of Dermatology: Nail fungus treatment. aad.org/public/diseases/a-z/nail-fungus-treatment
- NIDDK: Diabetes and foot problems. niddk.nih.gov/.../foot-problems