Yellow, crumbling toenails? Handled.
Brush it on twice a day. It takes 10 seconds. The max strength formula sinks past the hard nail and stops the fungus where it lives.
★★★★★ 4.8 · 1,500+ five star reviews
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25% Max Strength
Strongest you can buy
Loved by 1,500+
4.8 star average rating
Why it works
Strong enough to reach the fungus. Safe enough to use every day.
Most drops never reach the fungus. Your nail is a hard shell, and cheap water based drops just dry on top of it. The fungus keeps living underneath.
Nuvia is made with 25% undecylenic acid. That is the strongest dose you can get without a prescription. It rides in an oil base that softens the nail, so the medicine can sink to where the fungus lives and stop it from growing.
It also has vitamin E, aloe, and manuka oil to help the nail heal, plus peppermint and lavender to calm the itching and burning.
Get the best results
Six habits that speed up your progress
The formula does the hard work. These simple habits keep the fungus from coming back.
Dry your feet all the way
After you shower, use a hair dryer on warm for 60 seconds per foot. Focus between the toes and around the nails. Fungus feeds on moisture. (Skip this if you have diabetes or nerve issues in your feet. Low feeling raises burn risk.)
Rotate your shoes
Never wear the same pair two days in a row. Shoes need 48 hours to dry out inside. A weekly dusting of antifungal powder helps too.
Ditch cotton socks
Cotton holds sweat against your nails all day. Switch to bamboo or sport socks that pull sweat away from the skin.
Treat the skin too
Peeling or itchy skin between your toes is the same fungus. It can spread back to nails that are healing. Use an antifungal cream on the skin while you use Nuvia on the nail.
Clean your tools
Wipe your clippers with rubbing alcohol after every use. Use throw away files so you never spread spores back onto healthy nail.
Hot wash socks and bath mats
Wash socks, towels, and bath mats in hot water and dry them on high heat while you treat. Heat kills leftover spores.
Thousands have stopped hiding their feet
4.8 average from 1,500+ reviews
★★★★★
I hid my feet for almost six years. Beach trips, pool days, all of it in shoes. I did not expect much from this because nothing else worked. Around week four I saw clear nail coming in at the base of my big toe. I actually showed my husband. I wore sandals to a cookout last weekend for the first time in years.
Karen M. · Verified Buyer
★★★★★
I tried the vinegar soaks. My whole bathroom smelled like a salad bar and my nails looked the same. This is just a pen. I keep it next to my toothbrush and do it when I brush my teeth. Two weeks in and my thick nail was soft enough to trim down flat. That alone was worth it.
Denise R. · Verified Buyer
★★★★★
My doctor offered me the pills but I did not want the liver testing at my age. This felt like a safer bet. The itching around my nail calmed down in the first few days. Two months in, the yellow part is growing out and the new nail behind it looks normal.
Frank T. · Verified Buyer
★★★★★
Work boots ten hours a day did a number on my toes. Big nail was thick and pressed on my boot until it hurt to walk far. Filed it down like the guide says and used the pen morning and night. Pain eased up in about two weeks. Nail is clearing up slow but it is clearing.
Mike B. · Verified Buyer
★★★★★
Bought it for a fingernail I damaged at the gym that turned ugly. Fingernails grow faster so I saw the line of new clean nail in about three weeks. No smell, no mess, dries fast. Already ordered a second pen for my mom.
Jess L. · Verified Buyer
★★★★★
Honest review. This is not overnight. The first thing I noticed was my nails stopped crumbling when I clipped them. Then around week five there was a clear band at the cuticle. I am on month three now and about half the nail looks healthy. If you use it every day it does what it says.
Paul S. · Verified Buyer
★★★★★
Easiest thing I have ever used for this. Ten seconds and done. No soaking my feet in a bucket like my mother used to make me do.
Linda H. · Verified Buyer
★★★★☆
Three weeks in. Nails trim easier and the itch is gone but no clear growth yet. Sticking with it since everything says it takes a couple months. So far so good.
Greg W. · Verified Buyer
★★★★★
I was so embarrassed at my pedicure I used to apologize to the tech. Went last week and she asked what I had been using. That felt good.
Maria G. · Verified Buyer
★★★★★
Had this on both big toes for years from running. Tried Kerasal twice and gave up both times. This one actually softened the nail so I could file it down. Big difference by week six.
Tom D. · Verified Buyer
★★★★★
Bought it for my husband who would never buy it for himself. He grumbled and then used it because it was easy. His nails look better than they have in ten years.
Sandra P. · Verified Buyer
★★★★★
No smell is the big one for me. The tea tree stuff I used before announced itself to the whole room. This dries clear and fast and nobody knows.
Ray C. · Verified Buyer
★★★★☆
Works but the pen runs out faster than I expected using it on four nails twice a day. Buy the bundle if you have more than one bad nail.
Beth A. · Verified Buyer
★★★★★
I am diabetic so I checked with my doctor first and he was fine with a topical. Skin around the nail stopped peeling in the first week. New growth at the base by week five.
Carlos V. · Verified Buyer
★★★★★
I wore socks to bed for two summers. My new growth is clear and I am halfway grown out. I threw away the socks. That is the review.
Janet F. · Verified Buyer
★★★★★
Simple and it works if you keep at it. Morning and night, takes seconds. The trick is not skipping days. Set an alarm if you have to.
Dave K. · Verified Buyer
★★★★★
The brush gets right along the edges of the nail where the yellow starts. Way better than the dropper bottles that run everywhere.
Patty N. · Verified Buyer
★★★★★
Sixty two years old and figured I would just live with it. Daughter bought me this. Ten weeks later the ridged thick part is half gone. Should have dealt with this twenty years ago.
Steve H. · Verified Buyer
★★★★☆
One toe is clearing great, the stubborn big toe is slower. Support said the thick ones take longer and to file weekly. Doing that now. Four stars until the big one catches up.
Angela B. · Verified Buyer
★★★★★
BJJ guy here so my feet take a beating and the mats do not help. This fit my routine, right after showering at home. Six weeks and the nail bed looks pink again.
Marcus J. · Verified Buyer
★★★★★
Ordered Monday, arrived Wednesday. The guide with the shoe rotation and sock tips was actually useful. Feels like they want it to work, not just sell you a bottle.
Diane S. · Verified Buyer
★★★★★
I spent more on one podiatrist visit than three of these pens. Doing the math I wish I started here.
Bill R. · Verified Buyer
★★★★★
My nails were so brittle they cracked in my socks. The oil made them flexible again in about two weeks. Clearing came after. Be patient with it.
Nancy W. · Verified Buyer
★★★★★
Traveled two weeks for work and it came with me. No spills in the bag, no smell in the hotel room. Kept the streak going. That is why this works when the soaks never did.
Kevin O. · Verified Buyer
★★★★★
After my gel polish came off my nail underneath was yellow and rough. Used this instead of covering it up again. Two months later I do not need to cover anything.
Rosa M. · Verified Buyer
★★★★★
Does what it says. Itch gone in days, trimming easier in two weeks, clear growth starting around week five. Follow the directions and give it time.
Gary L. · Verified Buyer
Frequently asked questions
How long until I see results?
Most users notice softer, easier-to-trim nails and relief from itching within the first two weeks. Clear new growth typically becomes visible at the cuticle within 4–8 weeks. Because nails grow slowly, complete turnover takes several months — consistency is everything, which is why our guarantee is a full 120 days.
Why will this work when other topicals failed me?
Most topicals are water-based and physically cannot pass through the dense keratin of the nail plate — they dry into a film on top. Nuvia uses a lipid-based conditioning carrier that softens the keratin and transports 25% undecylenic acid down toward the nail bed where the problem actually lives.
Is it safe? Do I need blood tests like with prescription pills?
No. Nuvia is a topical, external-use formula — nothing enters your bloodstream the way oral antifungals do, so there's no liver monitoring, no blood tests, and no alcohol restrictions. If you have diabetes or circulation issues, check with your doctor before home treatment.
How do I use it?
Brush a thin coat over the entire nail, the edges, and under the tip twice daily — morning and night — on clean, dry nails. Once a week, lightly file the nail surface to help absorption. The whole routine takes under a minute.
Does it work on fingernails and toenails?
Yes. The precision brush pen works on both, and the conditioning oils benefit brittle, damaged nails of any kind.
Will it stain my nails or leave residue?
No. The formula absorbs cleanly without sticky residue, strong medicinal smell, or staining. You can put socks and shoes on shortly after applying.
What's actually in it?
25% undecylenic acid (maximum OTC strength) in a base of sweet almond, jojoba, and canola oils, with tea tree and oregano oils, vitamin E, aloe vera, manuka oil, and soothing peppermint, lavender, and propolis. Made in the USA, cruelty-free.
What if it doesn't work for me?
You're covered by a 30-day money-back guarantee — because nail recovery follows your body's growth cycle, not a marketing calendar. Not satisfied with your progress? Contact us for a full refund.