Nail treatment serum
Nail Strengthening Serum

$15
$15

  • Strengthens
    A clear glass bottle of Manucurist Nail Strengthening Serum with a white cap and green label, highlighting its strengthening benefits for damaged nails, is displayed against a pale beige background.
  • A close-up of a clear Manucurist Ultimate Routine - Soft Nails serum bottle on a pink background, with text stating 85% had harder nails and 81% saw fewer splits after 2 weeks—an effective nail hardener for repair.
  • Manucurist Nail Strengthening Serum—a potent nail care treatment—contains plant keratin, AHA, gluconolactone, biotin, silicon, and vitamin C to nourish and protect damaged nails.
  • Close-up of a fingertip shows a "before" with dry, peeling cuticles and an "after" with smooth, healthy skin after using Manucurist Nail Strengthening Serum. Text labels Before and After appear beneath each side.
  • A bare-nailed hand is shown as Manucurist Nail Strengthening Serum is applied. Text: Apply 1 to 3 times daily to bare nails for 7 days for strong, healthy nails.
  • Nail Strengthening Serum
    Nail Strengthening Serum
  • A manicured hand balances a bottle of Manucurist Nail Strengthening Serum on a glossy pink surface with a soft pink background—ideal for reviving and caring for damaged nails.
  • Two nail care bottles from Manucurist on a light beige background: Nail Strengthening Serum and Masque S.O.S. with pink liquid—ideal for restoring and strengthening damaged nails.
  • Three manicure products for nail care on a light pink background: a square bottle of Manucurist Nail Strengthening Serum, a square bottle of Masque S.O.S. overnight nail mask, and a tube of Concentré perfecteur.
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The miracle nail care that instantly strengthens and helps regenerate soft or damaged-looking nails.

Highly concentrated in plant-based keratin, silicon and biotin, this biomimetic formula helps naturally densify the nail plate.

Its fluid texture is instantly absorbed by the nail for deep, targeted action.

What type of nails do you have? Complete our analysis by clicking here and find out!

A metal tuning fork with two prongs and a handle is shown on a light, textured background. Applicator: Brush
A simple black and white sketch of a hand in a fist, viewed from the side, with three lines above it to indicate motion or emphasis. Nail type: Damaged, Soft, and Yellowed
A black checkmark inside a black circle on a light gray background. Benefits: Strengthens and regenerates nails
A simple black outline of a magic wand with a star at the tip, surrounded by small lines indicating sparkles or magical effects, on a light gray background. Usage: As a 2-week treatment

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4.6/5 – Trusted by 160,000+ customers globally

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Description

10% concentrated care formula

  • 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 aggressions

Proven visible results

  • 85% found their nails harder*
  • 81% found their nails stronger*
  • 81% found their nails were less likely to split*

Easy and fast application
The alcohol-based fluid texture is instantly absorbed, leaving the nail with no greasy or sticky finish.

Composed of 97,5% ingredients from natural origins.**

*Clinical test conducted under dermatological supervision on 25 individuals after two weeks of use.
**Calculation based on the international ISO 16128 standards.

How-to-use the Nail Strengthening Serum?

Your intensive repair care serum for soft or damaged-looking nails:

  • Apply 1 to 3 times a day on bare nails using the brush.
  • Let it dry completely until full absorption.
  • Repeat daily, for 5 to 7 days. No need to rinse or massage: the active ingredients are absorbed naturally by the nail.

If you wish to apply polish after this care, degrease the nail surface for optimum hold.

(Suitable from age 12)

Pro tip ✨

For very soft or damaged-looking nails, use as an intensive care treatement: apply 3 times a day for 7 days.

Sustainable Packaging

Glass Bottle: Emptied, cleaned and dried bottles can either be reused or placed in a recycling bin separate from other materials to avoid contamination. If your local municipality does not accept glass for recycling, bottles can be brought to a collection center. No need to remove labeling.

Plastic Cap (Plastic-type #5 - Polypropylene): Clean and remove cap from brush attachment and place in recycling bin or bring to a local collection center.

Nail Brush (Plastic-type #4 - Low Density Polyethylene): Clean and remove cap from brush and place in recycling bin or bring to a local collection center.

Label: No need to remove label as glass recycling processes will remove any labelling

Box (Kraft Paper Box): Paper box can be unfolded and added to paper recycling bin or brought to a local collection center, Kraft paper box can also be added to any compost bin.

As always, verify your local municipality's recycling regulations and procedures and for more information please go to berecycled.org/search or search.earth911.com

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% natural origin ingredients*

*Calculation based on the international ISO 16128 standards.
A clear glass bottle of Manucurist Nail Strengthening Serum with a white cap and green label, highlighting its strengthening benefits for damaged nails, is displayed against a pale beige background.
A close-up of a clear Manucurist Ultimate Routine - Soft Nails serum bottle on a pink background, with text stating 85% had harder nails and 81% saw fewer splits after 2 weeks—an effective nail hardener for repair.
Manucurist Nail Strengthening Serum—a potent nail care treatment—contains plant keratin, AHA, gluconolactone, biotin, silicon, and vitamin C to nourish and protect damaged nails.
Close-up of a fingertip shows a "before" with dry, peeling cuticles and an "after" with smooth, healthy skin after using Manucurist Nail Strengthening Serum. Text labels Before and After appear beneath each side.
A bare-nailed hand is shown as Manucurist Nail Strengthening Serum is applied. Text: Apply 1 to 3 times daily to bare nails for 7 days for strong, healthy nails.
Nail Strengthening Serum
A manicured hand balances a bottle of Manucurist Nail Strengthening Serum on a glossy pink surface with a soft pink background—ideal for reviving and caring for damaged nails.
Two nail care bottles from Manucurist on a light beige background: Nail Strengthening Serum and Masque S.O.S. with pink liquid—ideal for restoring and strengthening damaged nails.
Three manicure products for nail care on a light pink background: a square bottle of Manucurist Nail Strengthening Serum, a square bottle of Masque S.O.S. overnight nail mask, and a tube of Concentré perfecteur.

Miracle treatment: hardens and regenerates

A simple black outline of a magic wand with a star at the tip, surrounded by small lines representing sparkles or magical effects, on a light gray background.

Soft and damaged-looking
nail care

Simple black line drawing of an open right hand facing upward with three lines above it, suggesting receiving, offering, or presenting something.

Redensifies
the nail plate

A simple black and white line drawing of a nail polish brush with a rectangular handle and a curved brush tip.

Fluid texture that’s
instantly absorbed

How to use Keratin Booster? Perfect for soft, damaged-looking nails

  • A close-up of a hand applying clear nail polish to a fingernail using a brush. The background is neutral, keeping the focus on the nail and the application process.

    Apply 3 times a day on bare nails

  • A close-up of a hand with natural, well-groomed fingernails, gently resting on a white fabric. The nails are neatly shaped and have a healthy, glossy appearance.

    Allow to dry fully for complete absorption

  • A close-up of a person applying clear nail polish to their fingernail with a small brush. The nails are clean, trimmed, and natural-looking.

    Repeat the routine for 1 week

FAQs

Les questions les plus fréquemment posées par nos utilisatrices et notre communauté !

How long should I let the product dry?

The fluid texture is instantly absorbed by the nail. Simply let it air-dry for a few seconds, no rinsing needed.

Can I use the Keratin Booster several times a year?

Yes, you can repeat the care several times a year. It’s recommended to take a break between each care and monitor your nail’s condition over time.

Can I use the Keratin Booster with a base coat?

The Keratin Booster should be applied on bare nails only. If you wish to use a base coat, apply it after the care, once the nail has been cleansed.

Can I apply the Keratin Booster under Green™ or Green Flash™ polish?

Yes, but it’s essential to cleanse the nail surface after the product has been absorbed to ensure optimal polish adhesion.

Our customers talk about us!

Our reviews are collected 28 days after any purchase and these are the reviews of verified buyers only

Overall rating: 4.6843033 / 5 from 567 reviews.

AI Generated Review Summary

The nail strengthening serum is highly effective in reinforcing nails and soothing rough cuticles. Customers praise its excellent and biomimetic formula, which is highly concentrated in plant-based keratin, silicon, and biotin.

Summary topics

  • Product Effectiveness (6%): It was highlighted by customers that the product is excellent and effective in reinforcing the nails.
  • Nail Strengthening (24%): In general, customers found that this nail strengthening serum significantly strengthened and soothes rough cuticles.

Review topics: ["smell","feel","look","problem","improvement","boost","texture","nails","absorbs","glow","bottle","result","consistency","appearance","sensation","treatment","effect","keratin booster","care","difference","polish","serum","grow","use","become","help","break","strengthens","application","manicure"].

Review highlights

  • "My nails are already stronger and more flexible and it really softens and soothes rough cuticles." — Cathy R.
  • "This strengthening serum is really helping my nails get stronger and healthier." — Tasha O.
  • "The good: my nails feel significantly stronger!" — Heidi

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)

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)

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)

It’s easy to apply and

"It’s easy to apply and absorbs quickly. It strengthens the nails, but I can’t say that the results achieved over two weeks last very long."

— Ekaterina S. (4/5)

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)

Me ha gustado mucho,tenía las

"Me ha gustado mucho,tenía las uñas muy mal después de la semipermanente y las he recuperado. Gracias"

— Toñi E. (5/5)

ottimi prodotti prodotti li sto

"ottimi prodotti prodotti li sto utilizzando sulle mie unghie fragili dopo anni di gel"

— Tiziana P. (5/5)

Utilisé en duo avec le

"Utilisé en duo avec le masque sos, Les ongles sont vraiment régénérés en 15 jours, plus lisses et plus brillants"

— Armelle K. (5/5)

Q&A