Made in the USA 


Not Tested on Animals 

NONYX for Polished Nails is
Fungal Nail Clarifying


For polished fingernails and toenails that are yellow, thick, brittle, lifted, or discolored.

Nonyx Fungal Nail Clarifying Basecoat works under polish to clear out keratin debris where nail fungus thrives. Yellow, thick, brittle, lifted, or discolored nails are a sign of keratin debris.
Nonyx Basecoat is simple to use. Just brush on your bare nails before polishing. Reapply only when you change your polish. So simple! No more daily applications.
Enjoy wearing polish knowing that Nonyx Basecoat is working underneath to bring your nails back to their healthy-looking best!

For split and cracked nails

Split and cracked fingernails and thumbnails are difficult to grow out and annoyingly catch on clothes and other things that can even worsen the split or crack. Good news! While it will take several weeks Nonyx Basecoat repairs split nails by removing the almost invisible keratin debris buildup that is causing the split.

NONYX Fungal Nail Clarifying Basecoat is available in footcare at ShopRite,,  or Click here, to purchase directly from Xenna.



Write your own product review here.

So glad I found this product!

April 25, 2019


I have been using basecoat for 6 weeks and was able to trim a toenail that a Podiatrist said was dead and he wanted to remove. I am so glad I found this product!

Split toe nail help!!

October 29, 2018

Square Gravy

This product was amazing! Truly helped my split toe nail and helped make me feel comfortable to wear sandals again!

5.0 out of 5 stars (

February 21, 2017

T Bon, - Verified Purchase

I use the entire system . You must be consistent just like brushing your teeth, just make it part of your routine. I've tried products and every home remedy for over 20 years with no toenail because of pedicure damage....  I was tired. Patience paid off like never Before!  (Big) Toenail is completely grown back and beautiful!  I'm soo thankful that God allowed me to come across this line!!

5.0 out of 5 stars, Works beautifully under polish!

January 25, 2017

C. Holmes

I used Nonyx Basecoat on my toenails under polish and the white discoloration (on one big toenail) and brown discoloration (on the other big toenail) disappeared in a few months. It was so simple to use. My polish stayed on well and didn't chip. I would recommend this product to anyone who wants to wear polish and still treat their nails. Keratin debris was a really stubborn problem for me and now my nails look great, with or without polish! 

Displaying results 1-4 (of 7)
 |<  < 1 - 2  >  >| 


Unlike NONYX Nail Gel, NONYX BASECOAT can be applied under nail polish. Like NONYX Nail Gel, it breaks down and clears out discoloring keratin debris where nail fungus thrives.  NONYX BASECOAT also helps repair split nails.
Key Benefits:
  • Clears out yellowing keratin debris where nail fungus thrives.

  • Works under nail polish*

  • Helps repair split nails when applied for 10 to 12 weeks.

  • No more daily applications – apply twice a month or when you change your polish

  • Made in the USA


  • Free of parabens, preservatives and colorants

  • Vegan

  • Gluten-Free

  • One bottle lasts 6 months


*Not recommended for use with gel-type nail polish.

Add to Shopping Cart

Directions for Use:

Note Nonyx Basecoat should be used with standard, acrylic nail polishes.  It cannot be used with gel type polishes.   
Apply Nonyx Basecoat to clean, dry, bare nails.  When Nonyx Basecoat is completely dry (this can take up to five minutes), apply a regular nail polish basecoat, then two coats of your favorite nail polish and a top coat.  This layering of 4 coats of standard nail polish will assure the longest wear without chipping.  When you are ready to change your polish, remove all polish with nail polish remover and wash nails (which will remove any Nonyx Basecoat).  Pat nails dry, then reapply Nonyx Basecoat and your standard polishes, following the steps above.  After 3-6 weeks, begin scraping off any softened keratin debris behind the nail tips with a manicure tool or a nail brush devoted to this purpose. Continue applying Nonyx Basecoat and your favorite polish in this fashion for 3 to 9 months or until nails are clear.
For questions or comments please email


Deionized Water, Ethanoic Acid, Xanthan Gum, Fragrance


For external use only.
Keep out of reach of children.
Avoid eye contact.
This product contains an eye irritant. If eye contact occurs, flush with cool water immediately.
Do not use on fingernails thinned by use of artificial nails.
Not recommended for use on ingrown nails.
Not recommended for use under gel nail polish applied at salons with UV light (polish will lift).


What is keratin debris?
Keratin debris is the white, yellow or brown  discoloration or granular build-up that you see on or under your toenail or fingernail. If thick, keratin debris build-up can cause your nail to separate from the nail bed.
How long will it take to get out the keratin debris using Nonyx Basecoat?
If only the top edges of your nails look discolored or thicker, it should take 3 to 5 months to see results, depending on how fast your nails grow. The
softened keratin debris can usually start to be scraped away in 3 to 6 weeks.
My nail polish is chipping faster than before.  Why is this?
Some nail polishes, especially those that are inexpensive or beyond their normal shelf life, will not adhere to Nonyx Basecoat as well as the higher-end polishes and ones that are fresh. Try a different nail polish brand if you experience chipping or wear that is more than normal.
How can men use Nonyx Basecoat?
Men can apply Nonyx Basecoat in the same way and seal it with a clear nail polish or a matte clear polish which is completely invisible on the nail.  Without some type of polish over Nonyx Basecoat it will wash off. Men and children need to use a clear polish!
Can I use Nonyx Basecoat on my child’s nails?
You can use Nonyx Basecoat on your child’s nails if he/she is 5 years of age or older.  The basecoat and topcoat should be applied by an adult and changed weekly.  While wet, Nonyx Basecoat is an eye irritant, so keep it out of reach of your child when not in use. NonyX is non-toxic.
What is ethanoic acid?
The ethanoic acid in NonyX is the patented exfoliant of keratin debris. Ethanoic acid used in NonyX breaks down only the keratin debris. It has no effect on your normal nail plate. 

Is Nonyx Basecoat an Antifungal?
Because it has the same ingredients as regular Nonyx, Nonyx Basecoat clears out keratin debris where the fungus lives in the nail.  It is not an antifungal, however, because it does not attack the fungus directly – rather, it removes its life-support (keratin debris - the food supply and habitat of the fungus).  As the keratin debris is exfoliated over time, the fungus goes with it. 

Instrucciones para el uso: