Nail hardener
Nail Strengthening Serum

Regular price: 15 €
Regular price
Sale price: 15 €

Hardens

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The miracle strengthening treatment that instantly strengthens and regenerates soft, damaged nails.

Highly concentrated in plant keratin, silicon and biotin, this biomimetic formula boosts keratin production and densifies the nail plate.

Its fluid texture is immediately absorbed by the nail for deep action.

What is the nature of your nails? Take our diagnosis by clicking here to find out!

Applicator: Brush tip

Nail types: Damaged and Soft

Benefits: Strengthens & regenerates

How to use: As a 2-week treatment

I choose my option:

Keratin Booster 15 € Most popular ✨Keratin Booster + S.O.S. Mask ~~30 €~~ 25 € The best deal ✨Keratin Booster + S.O.S. Mask + Perfecting Concentrate ~~47 €~~ 38 €

Free delivery on orders over 39€

Pay in 3 interest-free instalments (orders over 80€)

Your expert A question about this product?

Description

Concentrated care formula at 10%

Plant-based keratin: intensely nourishes fragile nails
AHA & Gluconolactone: gently exfoliate the nail plate
Silicon: helps strengthen the nail
Biotin (vitamin B8): helps harden and fortify the nail
Vitamin C: protects the nail from external aggressors

Proven visible results

85% find their nails harder*
81% find their nails stronger*
81% find their nails less split*

Easy and quick application
Its fluid alcohol-based texture opens the nail scales for deep penetration into the keratin layers of the nail. Its immediate absorption leaves the nail with no greasy or sticky finish.

Made with 96.5% naturally derived ingredients**

*Clinical test under dermatological control on 25 people after 2 weeks of application.
**Calculation based on the international standard ISO 16128.

How to use the Keratin Booster?

Your repair treatment for soft, damaged nails:

Apply 1 to 3 times a day to bare nails using the brush.
Let dry until the formula has fully absorbed. No need to rinse or massage: the active ingredients are naturally absorbed by the nail.
Repeat daily for 5 to 7 days.

If you wish to apply nail polish after this treatment, degrease the nail surface for optimal wear.

(From age 12)

Pro tip ✨

For very soft or damaged nails, apply as an intensive treatment: 3 times a day for 7 days.

Ingredients / INCI

Super ingredients

INCI list

ALCOHOL DENAT., AQUA (WATER), PRUNUS ARMENIACA (APRICOT) KERNEL OIL, DIMETHYL SULFONE, PARFUM (FRAGRANCE), GLYCOLIC ACID, POLYACRYLATE CROSSPOLYMER-6, PHAEODACTYLUM TRICORNUTUM EXTRACT, HYDROLYZED CICER SEED EXTRACT, CHENOPODIUM QUINOA SEED EXTRACT, LENS ESCULENTA (LENTIL) SEED EXTRACT, PENTYLENE GLYCOL, GLUCONOLACTONE, ISOPROPYL ALCOHOL, ACETYL CYSTEINE, MAGNESIUM ASCORBYL PHOSPHATE, BIOTIN.

96.5% ingredients of natural origin*

*Calculation based on the international ISO 16128 standard.

Miracle hardening treatment that strengthens and regenerates

Boosts
the production of keratin

Redensifies the plate
of the nail

Fluid texture
immediately absorbed

How to use the Keratin Booster?
Ideal for soft and damaged nails

Apply 3 times a day to bare nails
Leave to dry until fully absorbed
Repeat the process for 1 week

How long should I let the product dry?

The fluid texture is immediately absorbed by the nail. Simply let it dry naturally for a few seconds, no rinsing required.

Can you do a Keratin Booster treatment several times a year?

Yes, you can repeat the treatment several times a year. We recommend taking a break between each treatment and monitoring how your nails progress.

Can Keratin Booster be used with a treatment base coat?

Keratin Booster is used on its own, on bare nails. If you want to follow with a treatment base coat, apply it only after the treatment course and after cleansing the nail.

Can I use the Kératine Booster under a Green™ or Green Flash™ polish?

Yes, but it is essential to degrease the nail surface after the treatment has been absorbed to ensure good polish hold.

Our customers are talking about us!

We collect reviews 28 days after purchase, and publish only reviews from verified buyers.

Overall rating: 4.6929827 / 5 from 570 reviews.

AI Generated Review Summary

Kératine Booster is a highly concentrated treatment praised for its ability to strengthen and regenerate weak and damaged nails. Customers appreciate its healthy and glossy appearance, pleasant scent, and quick improvement in nail look. While some users report super and amazing results, others find the outcomes disappointing.

Summary topics

Nail Appearance (3%): Customers keep praising how this treatment makes their nails look healthy and glossy even without polish.
Product Scent (6%): Customers expressed appreciation for the pleasant scent of the product, which was easy to apply and leaves a fabulous scent.
Treatment Effectiveness (9%): It was highlighted by customers that this treatment is incredibly effective, super effective, and very effective.
Keratin Boost (5%): It was reported by customers that the Keratin Booster is an absolute game changer and highly recommended.
Nail Strength (29%): Opinions vary, but the nails appear stronger and more beautiful after just a few weeks of use.

Review topics: ["color","smell","feel","problem","improvement","look","boost","nails","absorbs","texture","glow","result","appearance","bottle","quality","treatment","consistency","strength","sensation","effect","fragrance","keratin booster","care","difference","polish","serum","use","grow","application","works"].

Review highlights

"Very good care, my nails harden well without splitting like before." — françoise t.
"The product smells good, the nail takes it on its own and quickly!" — Valentine C.
"Excellent product for strengthening soft and damaged nails." — Laura V.

Reviews

Me encanta el keratine booster,

"Me encanta el keratine booster, te recupera en 2 semanas las uñas después de una rutina de manicura semi permanente. Tengo 55 años, siempre me he hecho la semi permanente (30 Años sin descanso)y ahora me estoy cuidando mucho mis uñas y mis manos con esta firma. La encuentro estupenda en todos los productos que pruebo y cumplen perfectamente su cometido . Y ahora me ha dado por los colores que me duran una semana con la base SOS y el top coat. El quitaesmalte es una pasada también. Lo más importante es la recuperación de mis uñas y lo tengo conseguido ! Venden calidad !!!!"

— Maria C. (5/5)

Excelente producto

"Me encanta. . . Es, simplemente, maravilloso, alimento para las uñas. Hoy en día es para mí, junto con el resto de mi kit de reparación, fundamental para tener unas uñas fuertes y reparadas. Las uñas se ven lisas y blanquitas. Lo uso varias veces a diario cuando mis uñas estarán sin esmalte. Es mi tercer bote y, desde luego, no el último. Totalmente recomendable."

— Nía (5/5)

Zero stars, I have not

"Zero stars, I have not received my serum so cant leave a review. First bottle arrived smashed, second and third replacements never received. Its becoming a joke now."

— Heather C. (5/5)

Le soin est très apprécié

"Le soin est très apprécié pour durcir et réparer les ongles mous ou abîmés en quelques jours. La texture non collante."

— Tatiana Y. (5/5)

Application facile, résultats rapide avec

"Application facile, résultats rapide avec des ongles plus forts dès quelques jours d'applications, je l'emporte partout"

— caroline v. (5/5)

Keratin booster a vraimment fait

"Keratin booster a vraimment fait du bien à mes ongle ! Ils se dédoublaient étaient mous, je vois une réelle différence !"

— Erika T. (5/5)

Schon nach ein paar Tagen

"Schon nach ein paar Tagen sind die Nägel glatter, fester und schuppen nicht. Einfache Anwendung, trocknet schnell und ist sehr ergiebig. Super Lösung für meine weiche, rissige Nägel."

— Jitka C. (5/5)

Je l’ai utilisé pendant un

"Je l’ai utilisé pendant un mois tous les soirs, j’avais les ongles tellement abîmé que je n’arrive pas à savoir si le kératine booster a fait son effet."

— sa.lys@hotmail.fr ‎. (4/5)