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  • 5 VIDEOS
MAVALA Beauty Routine Brand StoryAesir Canada
  • Mavala Scientifique K+ Nail Hardener & Strengthener, Care Treatment for Weak, Brittle, Soft, Splitting, Flakey Nails, Made in Switzerland, Natural Ingredients for Stronger, Harder Nails, Clear, 5 ml
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Mavala Scientifique K+ Nail Hardener & Strengthener, Care Treatment for Weak, Brittle, Soft, Splitting, Flakey Nails, Made in Switzerland, Natural Ingredients for Stronger, Harder Nails, Clear, 5 ml

4.2 out of 5 stars 10,606 ratings
鶹's Choice highlights highly rated, well-priced products available to ship immediately.
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Purchase options and add-ons

Brand MAVALA
Item form Liquid
Item weight 5 Grams
Liquid volume 5.0
Specialty Weak, Splitting, Brittle, Flaking, Damaged
Number of Items 1
Unit count 5.0 Milliliters
Manufacturer MAVALA
Global Trade Identification Number 07618900995017

About this item

  • Winner of the Prevention Best of Beauty Award for Best Nail Strengthener, recognized for its proven effectiveness in repairing and strengthening damaged, brittle nails. Build strongr, healthier nails – Say goodbye to weak, brittle nails! MAVALA Scientifique K+ hardens and strengthens the nail tip, reducing breakage and helping your nails grow beautifully long.
  • Powerful Nail Hardener – Our scientifically advanced formula reinforces the nail plate by bonding keratin fibers together, making nails more resistant to daily wear and tear.
  • Natural Strengthening Ingredients– Enriched with crystal resin tears from the pistachio mastic tree, this formula supports the natural keratinization process, reinforcing nails from within.
  • Prevents Breakage and Splitting – Perfect for soft, peeling, or damaged nails, this treatment helps prevent chipping, cracking, and splitting so you can maintain flawless nails and long-lasting manicures.
  • Easy and Effecive Application – Simply apply a thin layer to the center of the nail and extend to the tip. Dries quickly and works instantly—just follow with your favorite base coat, polish, and top coat.
  • Vegan and Cruetly Free – We never test on animals and use only 100% vegan ingredients, so you can feel good about your nail care routine.

Frequently bought together

This item: Mavala Scientifique K+ Nail Hardener & Strengthener, Care Treatment for Weak, Brittle, Soft, Splitting, Flakey Nails, Made in Switzerland, Natural Ingredients for Stronger, Harder Nails, Clear, 5 ml
$32.99($6.60/millilitre)
Get it by Monday, Jul 21
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Important information

Ingredients

Contains Dimethylurea, a hardener of the nail keratin, and Crystal resin tears, from the pistachio mastic tree, native from the island of Chios in Greece. This gum extract supports the natural keratinization process of nails, reinforcing them. The nail plate will become richer in keratin, therefore more resistant.

Directions

Remove manicure and any oily film from nails. Apply MAVALA SCIENTIFIQUE K+ from the centre of the nail to the tip only. Avoid touching cuticles and skin around nails, in order not to harden them as well. Leave to penetrate for one minute, by holding hands downwards so that the product does not run onto the cuticles. Its application can be followed by your usual manicure (base coat, nail polish, top coat). Use two to three times a week until nails have obtained the desired hardness. Then, you may space out the applications.


From the brand


Product Description

French Manicure

Grow your Nails for a Strong, Beautiful, and Natural Style - Perfect for French Manicures

Perfect for maintaining French manicures, MAVALA Scientifique K+ keeps nail tips strong, smooth, and resistant to chipping. Its formula hardens the nail plate by sealing together the three layers of the nail and thus allowing splitting, soft and therefore brittle nails, to regain their normal appearance, strength and shine. And for easier application, it is also available in a handy pen format.

Flagship K+

The Gold Standard of Nail Hardeners, World Renound and Award Winning

MAVALA Scientifique K+ strengthens soft, splitting nails by hardening the nail tip—where breakage starts. Its keratin-boosting formula penetrates deeply, bonding with the nail’s natural structure to restore resistance and prevent flaking. Formulated with 90% of natural origin ingredients. Contains Dimethylurea, a hardener of the nail keratin, and Crystal resin tears, from the pistachio mastic tree, native from the island of Chios in Greece. This gum extract supports the natural keratinization process of nails - the nail plate will become richer in keratin & more resistant.

K+ Nails

Help Grow your Nails Long, Hard, Strong, & Beautiful with Natural Ingredients

MAVALA SCIENTIFIQUE K+ hardens the nail plate thanks to a scientific active ingredient that improves the cohesion of keratin fibres thus allowing the three principal nail layers to bond together. It also contains crystal resin tears, a gum extracted from the pistachio mastic tree that helps the natural keratinization process of nails, reinforcing them. This penetrating aqueous solution, that is neither a base nor a nail polish, hardens soft nails and avoids them breaking or splitting.

Apply MAVALA SCIENTIFIQUE K+ from the centre of the nail to the tip only.

Application - Get the Best Results

Apply MAVALA SCIENTIFIQUE K+ from the centre of the nail to the tip only. Avoid touching cuticles and skin around nails, in order not to harden them as well. Leave to penetrate for one minute, by holding hands downwards so that the product does not run onto the cuticles.

Before and After

MAVALA Scientifique K+ strengthens soft, splitting nails by hardening the nail tip—where breakage starts. Its keratin-boosting formula penetrates deeply, bonding with the nail’s natural structure to restore resistance and prevent flaking.

3

World Famous Nail Hardener

Mavala Scientifique K+ hardens and strengthens the nail plate thanks to a scientific active ingredient that improves the cohesion of keratin fibers thus allowing the three principal nail layers to bond together.

diamond

Diamond Strength - Prevents Nail Breakage

Mavala nail hardener helps keep the tip of the nail - the most fragile, unprotected part - from breaking easily.

K+ Held

Combine with your Favourite Polish

Apply 2-3 times a week on clean nails from center to end (not to the whole nail). Quickly absorbs. Easy handling. Next deired polish layers can be applied.

Wood

Decades of Results

Designed with over 60 years of experience in the nail care industry by MAVALA experts.

Holding package

Nail Care at its Finest

The tip of the nail is the most fragile, most unprotected part and breaks easily. This is therefore the part of the nail to be strengthened.

before after

Before and After Results

Protect cuticles and skin around nails with grease or oil before application. Never apply under nail tips, on cuticles, on skin, this is to avoid skin hardening. Otherwise, wipe it off with a damp cotton wool.

Nails

Strong, Long, Beautiful Nails

Its application can be followed by your usual manicure (base coat, nail polish, top coat). Use two to three times a week until nails have obtained the desired hardness. Then, you may space out the applications.

Product information

Technical Details

Manufacturer ‎MAVALA
Place of Business ‎HAUPPAUGE, NY, 11788 US
Language ‎French
Item model number ‎99501
Product Dimensions ‎2.54 x 2.54 x 6.99 cm; 5 g
ASIN ‎B076DJRBFP

Additional Information

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Mavala Scientifique K+ Nail Hardener & Strengthener, Care Treatment for Weak, Brittle, Soft, Splitting, Flakey Nails, Made in Switzerland, Natural Ingredients for Stronger, Harder Nails, Clear, 5 ml


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Product details

  • Batteries ‏ : ‎ Unknown batteries required.
  • Is discontinued by manufacturer ‏ : ‎ No
  • Language ‏ : ‎ French
  • Product Dimensions ‏ : ‎ 2.54 x 2.54 x 6.99 cm; 5 g
  • Date First Available ‏ : ‎ Jan. 18 2018
  • Manufacturer ‏ : ‎ MAVALA
  • Place of Business ‏ : ‎ HAUPPAUGE, NY, 11788 US
  • ASIN ‏ : ‎ B076DJRBFP
  • Item model number ‏ : ‎ 99501
  • Country of origin ‏ : ‎ Switzerland
  • 鶹 Rank: #3,774 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care)
  • Customer Reviews:
    4.2 out of 5 stars 10,606 ratings

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Customer reviews

4.2 out of 5 stars
10,606 global ratings

Review this product

Share your thoughts with other customers

Customers say

Customers like the effectiveness, quality, and appearance of the nail treatment. They mention it works well for their nails, hardens the tips, and prevents the nails from breaking. Customers also appreciate that it dries super fast. However, some customers have mixed opinions on its durability.

36 customers mention "Effectiveness"26 positive10 negative

Customers are satisfied with the effectiveness of the nail treatment. They mention it works well, gives great results, and slowly repairs their nails. Some also say it's a nice nail hardener that dries fast after application.

"I've used this for a number of years. It really works, and best thing is that it dries super fast so you can get on with your chores right away!" Read more

"Great product, it really works. It hardens the tips of the nail and prevents the nails from breaking...." Read more

"To date this has done nothing for my nails. They continue to peel. This AM one that I thought had recovered peeled again!..." Read more

"It’s a bit expensive, but has always strengthened my nails and repaired them" Read more

16 customers mention "Nail strength"14 positive2 negative

Customers like the nail strength of the product. They mention it makes their nails hard and strong. Some say it hardens the tips of the nails and prevents them from breaking. They also say it lasts for a very long time as little is used for each application.

"Great product, it really works. It hardens the tips of the nail and prevents the nails from breaking...." Read more

"Expensive but worth every penny. Makes your nails hard and strong." Read more

"I've used this for over 45 years now and it's still the best hardener out there. It's liquid, so it's not like a base...." Read more

"...i applied this to my nails a few times per week and they have become stronger and grown too. would recommend:)" Read more

15 customers mention "Quality"15 positive0 negative

Customers like the quality of the nail treatment. They mention it doesn't need to be removed and dries fast after application.

"Great product, it really works. It hardens the tips of the nail and prevents the nails from breaking...." Read more

"Amazing product" Read more

"...Great Del. will reorder love it" Read more

"WOW! This stuff is amazing! My nails were splitting VERTICALLY. I have some health issues...." Read more

5 customers mention "Appearance"5 positive0 negative

Customers are satisfied with the appearance of the nail treatment. They mention that their nails are looking absolutely amazing and the product is matt with no shine.

"...for nail biting and I wanted for strengthening and helping nails improve the look good again. Thank you 鶹." Read more

"...wearing gel polishes for 3 months and this product my nails are looking absolutely amazing! I can't remember last time they looked this good!" Read more

"...You can notice the difference after a month. And it is matt with no shine which is a huge plus for me." Read more

"My nails are finally strong and beautiful. I would highly recommend this product" Read more

3 customers mention "Drying time"3 positive0 negative

Customers are satisfied with the drying time of the nail treatment. They mention it dries super fast, allowing them to get on with their activities.

"I expected this to work. I liked that it was instantly drying and you didn’t have to wait but after weeks of use I found my nails were still weak." Read more

"Fantastik product. No need to Remove it. Dry fast after application. Nails Grow better and stronger." Read more

"...It really works, and best thing is that it dries super fast so you can get on with your chores right away!" Read more

BEST THING FOR YOUR NAILS !
5 out of 5 stars
BEST THING FOR YOUR NAILS !
If you’re thinking about getting this ….don’t wait any longer. At first I thought it was kind of expensive but the small bottle last a very long time and works wonders. My hands are pretty busy during the day so I would always have my nails split which sucks ! But since using this product it hasn’t been happening as much as before . I apply it twice a week and my nail really do feel stronger. I’m ordering my second bottle after a few months of having the first one so I thought I should leave a review.
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Top reviews from Canada

  • Reviewed in Canada on May 31, 2025
    Verified Purchase
    Great product, it really works. It hardens the tips of the nail and prevents the nails from breaking. Mine's were separating in layers and it has help the nail to recovery and stay healthy.
  • Reviewed in Canada on June 15, 2025
    Verified Purchase
    Excellent produit , meilleur que tout ce qu’on vend pour renforcer les ongles.
    One person found this helpful
    Report
  • Reviewed in Canada on June 5, 2025
    Verified Purchase
    If you’re thinking about getting this ….don’t wait any longer. At first I thought it was kind of expensive but the small bottle last a very long time and works wonders. My hands are pretty busy during the day so I would always have my nails split which sucks ! But since using this product it hasn’t been happening as much as before . I apply it twice a week and my nail really do feel stronger. I’m ordering my second bottle after a few months of having the first one so I thought I should leave a review.
    Customer image
    5.0 out of 5 stars
    BEST THING FOR YOUR NAILS !

    Reviewed in Canada on June 5, 2025
    If you’re thinking about getting this ….don’t wait any longer. At first I thought it was kind of expensive but the small bottle last a very long time and works wonders. My hands are pretty busy during the day so I would always have my nails split which sucks ! But since using this product it hasn’t been happening as much as before . I apply it twice a week and my nail really do feel stronger. I’m ordering my second bottle after a few months of having the first one so I thought I should leave a review.
    Images in this review
    Customer image
    2 people found this helpful
    Report
  • Reviewed in Canada on March 27, 2025
    Verified Purchase
    To date this has done nothing for my nails. They continue to peel. This AM one that I thought had recovered peeled again! Whether my nails are harder or not is debatable. They don't feel much harder to me.
    2 people found this helpful
    Report
  • Reviewed in Canada on July 2, 2025
    Verified Purchase
    Not sure if it works yet but I’ve been using it for the past 3 months
  • Reviewed in Canada on May 5, 2025
    Verified Purchase
    I really like this product my nails feel harder all ready after 2 applications II believe oi will cure my problem. Great Del.
    will reorder love it
  • Reviewed in Canada on May 3, 2025
    Verified Purchase
    Excellent !
    Mes ongles sont plus forts qu'avant!
    One person found this helpful
    Report
  • Reviewed in Canada on April 23, 2025
    Verified Purchase
    WOW!
    This stuff is amazing! My nails were splitting VERTICALLY. I have some health issues. Although skeptical, I thought I would try it anyway. I have been using it exactly as directed for about 6 weeks. My nails are on the mend! It is nothing short of a miracle. My nails are getting stronger, too. I LOVE this product! I am so grateful to have found something that works as well as this. Awesome product!!!!!
    3 people found this helpful
    Report

Top reviews from other countries

Translate all reviews to English
  • Rodolpho and Nicole
    5.0 out of 5 stars Long and strong nails in 4 months of use
    Reviewed in the Netherlands on September 15, 2024
    Verified Purchase
    I made a comment after 2 months of use and came here to correct it.

    Well, my nails always took a long time to grow (because I always bit them), I did stretching in Brazil, and it ruined my nail (it became as thin as paper). I bought this product and used it for 1 month and a half and my nails were weaker than before, I actually thought it wasn't working, but I kept using it.

    Today, 3 and a half months later I am shocked!!!!! My nails grow in 1 week, I always have to file them (otherwise they get huge and make it difficult to wash my hair, lol). They are hard (they no longer bend, they no longer break).

    I'm taking 1 Biotin tablet just to help with growth. I saw some Brazilian reviews, where the girls say that the Mavala bottle lasted 1 year, and despite using it every week, and having been using it for almost 4 months, now I'm buying the second bottle (I still have a little in the bottle, but I don't want to interrupt the use, until a new bottle arrives).

    I think it's worth it. How I use it: I remove the cuticle, wash the nail with a brush (nail) and neutral soap (top and bottom of the nail), dry well, and then apply Mavala Top Coat. I wait for it to dry and apply the polish normally. I only use it when I get my nails done (1x/week).

    I posted a before photo (with cell phone in hand) and an after photo (with nailsssss).
    Customer image
    Rodolpho and Nicole
    5.0 out of 5 stars
    Long and strong nails in 4 months of use

    Reviewed in the Netherlands on September 15, 2024
    I made a comment after 2 months of use and came here to correct it.

    Well, my nails always took a long time to grow (because I always bit them), I did stretching in Brazil, and it ruined my nail (it became as thin as paper). I bought this product and used it for 1 month and a half and my nails were weaker than before, I actually thought it wasn't working, but I kept using it.

    Today, 3 and a half months later I am shocked!!!!! My nails grow in 1 week, I always have to file them (otherwise they get huge and make it difficult to wash my hair, lol). They are hard (they no longer bend, they no longer break).

    I'm taking 1 Biotin tablet just to help with growth. I saw some Brazilian reviews, where the girls say that the Mavala bottle lasted 1 year, and despite using it every week, and having been using it for almost 4 months, now I'm buying the second bottle (I still have a little in the bottle, but I don't want to interrupt the use, until a new bottle arrives).

    I think it's worth it. How I use it: I remove the cuticle, wash the nail with a brush (nail) and neutral soap (top and bottom of the nail), dry well, and then apply Mavala Top Coat. I wait for it to dry and apply the polish normally. I only use it when I get my nails done (1x/week).

    I posted a before photo (with cell phone in hand) and an after photo (with nailsssss).
    Images in this review
    Customer imageCustomer image
  • Tanja
    5.0 out of 5 stars Ein kleines Wundermittel
    Reviewed in Germany on August 20, 2023
    Verified Purchase
    Unglaublich effektiv. Schon nach zwei-maligem Anwenden habe ich einen Unterschied gemerkt.

    Im Urlaub bin ich zu einem Nageldesigner gegangen, der meine Nägel leider viel zu stark abgeschliffen hat. Das Resultat war katastrophal. Meine Nägel waren danach sehr dünn, brüchig und biegsam wie dünnes Papier.

    Meine Mutter, die generell dünne Nägel hat, konnte mir auch keinen Härter nennen, der so dünne, beschädigte Nägel effektiv unterstützt.
    Auf der Internet-Suche nach einem funktionierendem Nagelhärter bin ich auf Mavala Scientifique K+Nagelhärter ohne Formaldehyd gestossen.
    Aufgrund der vielen guten Rezessionen habe ich mich dafür entschieden - und bin nicht enttäuscht worden.

    Nach nur 1,5 Wochen sind meine Nägel nicht mehr von selbst eingerissen oder abgebrochen. Wenn ich mit dem Fingerkuppe auf die Oberseite der Nägel drückte, sind die diese nicht mehr - wie vorher - nach unten gebogen.

    Nach 3 Wochen habe ich die die Anwendung von "jedem zweiten Tag" auf jeden dritten oder vierten ausgedehnt. Dies passierte auf natürliche Weise, da ich aufgrund der Stärke der Nägel einfach vergessen habe, sie zu behandeln.

    Nach 4 Wochen hatte ich wieder starke, natürliche Nägel, die nicht brechen und lang wuchsen.

    Da mein Erfolg bei den beschädigten Nägeln so herausragend war, kaufte ich nach 2 Wochen auch für meine Mutter eine Flasche, die genauso gute Erfahrungen mit ihren natürlich dünnen Nägeln machte. Das erste Mal seit Jahrzehnten muss sie ihre Nägel nicht lackieren, damit sie nicht sofort brechen.

    Ich kann jedem mit brüchigen oder dünnen Nägeln empfehlen, dieses Produkt auszuprobieren.
    Report
  • 鶹 Customer
    5.0 out of 5 stars It is effective.
    Reviewed in the United States on July 2, 2025
    Verified Purchase
    It is effective.
  • Judy
    5.0 out of 5 stars Good
    Reviewed in the United Arab Emirates on February 19, 2025
    Verified Purchase
    Helped strenghtening my nails a lot after using hard gel for 2months.
    It takes time to heal your nails but definitely helped hardening them
  • Morgane S
    5.0 out of 5 stars ÉٴDzԲԲԳ!
    Reviewed in France on April 11, 2024
    Verified Purchase
    Je suis vraiment pas déçue !
    ✨ Contexte: j'ai les ongles abîmés par une dépose mal réalisée et j'utilise mes mains et ongles tous les jours au travail de façon intensive. ✨

    Ça fait 1 semaine que je l'applique tous les jours (2 couches), et parfois 2 fois par jours. Au bout d'une semaine je vois et sens déjà une grande différence. Le bout de l'ongle est plus dur et résistant. Les endroits où j'avais des dédoublement s'effacent, et Le bout de l'ongle est plus blanc.

    Avantages du produit : est absorbé très rapidement par l'ongle, le temps que je fasse la 2ème main, la 1ere est sèche donc je peux enchaîner direct avec la 2eme couche. L'odeur est neutre. Il fonctionne sur moi.

    Inconvénients : rien a voir avec le produit, c'est le carton dans lequel on le reçoit qui est nul est pas adapté, l'emballage du produit était tout abîmé, c'est hyper risqué. On envoi pas ce type de colis dans un carton plat !

    Je recommande, j'ai hâte de voir l'évolution sur plusieurs semaines / mois !

    EDIT 05/05 : Après quelques semaines d'utilisation, je vois que mes ongles sont en bien meilleur état et plus épais et plus durs. J'ai toujours de la casse sur les ongles que je malmène le plus au travail, mais j'ai pas trop le choix , j'ai pris pour habitude d'utiliser mes ongles comme des outils ahah. Faite attention a ne pas en mettre sur votre peau car effectivement, ca va beaucoup la durcir !!
    Bref je continue le traitement et reviendrai donner des nouvelles petit à petit

    EDIT 06.07 : j'utilise toujours le produit, 2 couches tous les 4 jours environ. Mes ongles ont vraiment changé, ils sont plus beaux et résistants, le bout de l'ongle est bien plus dur et j'ai nettement moins de casse.
    La prochaine étape serait de reprendre les poses de VSP et de continuer ce traitement.
    Je continue donc de vous recommander le produit que je trouve très efficace ! 😊

    EDIT 18/08 : J'utilise toujours le produit ( il semble encore plein, j'ai l'impression qu'une vie ne suffira pas a en venir a bout ahah). Environ 2 applications par semaines, je ne saurai plus m'en passer. Mes ongles sont bien plus beaux et forts qu'avant, malgré le boulot j'arrive à les maintenir en bonne santé! Donc je le recommande toujours, si vous avez les ongles abimés par des poses et déposes de vernis semi- permanent etc, vous allez les ressusciter !

    EDIT 17/11/24 : Et ben sans surprise, quand j'oublie d'en mettre pendant au moins 1 semaine, mes ongles redeviennent mous et cassants .. donc le produit est toujours aussi efficace sur moi et je vois une réelle différence !

    EDIT 15/06/2025: me revoilà :) plus d'un an d'essai plus tard! mon avis reste le même, ce produit fonctionne très bien sur moi, la différence est flagrante quand je fais une pause du produit, mes ongles cassent vite et poussent lentement et quand je recommence à l'utiliser, mes ongles poussent vraiment tellement plus vite et plus forts ! je n'ai toujours pas fini le flacon acheté il y a un an, achat hyper rentable, je vous le recommande toujours :)