Nail strengthener and hardener
Force Nail Hardener

$15
$15

  • Fortifies
    A clear glass bottle of Manucurist Force Nail Hardener with a white cap stands against a pale peach background. The label reads "Hardens Protects" in French and English.
  • A clear bottle of Manucurist Force Nail Hardener appears on a beige background, featuring text that highlights stronger, protected, regenerated, and harder nails in 14 days.
  • A close-up of Manucurist&
  • Two bottles of Manucurist Force Nail Hardener are displayed on a pink background, highlighting its benefits: hardens soft nails, strengthens and restores the nail plate, gently exfoliates, and promotes healthy regrowth.
  • A clear glass bottle of Manucurist Force Nail Hardener with a white cap and label reading "Base fortifiante" and "Hardens protects," set against a soft beige and white background.
  • Shown are three Manucurist base coats—including the S.O.S. Nail Strengthener—each labeled for specific nail needs, with descriptions and illustrations provided beneath each bottle for nail repair and brittle nails.
  • A clear bottle of Manucurist Force Nail Hardener and a white nourishing nail pen are displayed on a light beige background.
  • Three Manucurist products on a light pink background: Force Nail Hardener in a square bottle, a nail and cuticle serum with a dropper, and a nourishing nail pen in a tube.
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The treatment base designed to strengthen and reinforce soft, thin nails over time.

The Strengthening Base is a fortifying polish enriched with AHAs, PHAs, and silica to strengthen nails from within and create a protective shield that resists everyday impacts.

After just one week of use, nails are noticeably stronger and more resistant to breakage.

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: Soft
A black checkmark inside a black circle on a light gray background. Benefits: Hardens and protects 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 or before application

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

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Description

This Vegan nail care base, composed of 85% plant-based ingredients and enriched with AHAs and PHAs, stimulates cell renewal to promote healthy, fast nail growth. Apply as a base coat before using Green nail polish or as a one-week treatment for naturally stronger nails!

Strengthens and reinforces
Enriched with AHAs and silica
Intensive repair for soft nails
Can be used as a base coat
Recyclable glass bottle

How to use?

For maintenance, apply alone or before applying your Green nail polish. For a treatment cure, apply twice a week.

Pro tips ✨

Use as a stand-alone treatment, or as a classic base under Green nail polish - a true 2-in-1!

Sustainable Packaging

Glass Bottle: Emptied, cleaned and dried bottles can either be reused or placed in a recycling bin seperate from other materials to avoid contamination. If your local manicapality 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 labelilng

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

ethyl acetate, butyl acetate, nitrocellulose, adipic acid/neopentyl glycol/trimellitic anhydride copolymer, acetyl tributyl citrate, alcohol, glycolic acid, aqua (water), n-butyl alcohol, etocrylene, gluconolactone, trimethylpentanediyl dibenzoate, CI 60725 (violet 2)

80% plant-based
A clear glass bottle of Manucurist Force Nail Hardener with a white cap stands against a pale peach background. The label reads "Hardens Protects" in French and English.
A clear bottle of Manucurist Force Nail Hardener appears on a beige background, featuring text that highlights stronger, protected, regenerated, and harder nails in 14 days.
A close-up of Manucurist&
Two bottles of Manucurist Force Nail Hardener are displayed on a pink background, highlighting its benefits: hardens soft nails, strengthens and restores the nail plate, gently exfoliates, and promotes healthy regrowth.
A clear glass bottle of Manucurist Force Nail Hardener with a white cap and label reading "Base fortifiante" and "Hardens protects," set against a soft beige and white background.
Shown are three Manucurist base coats—including the S.O.S. Nail Strengthener—each labeled for specific nail needs, with descriptions and illustrations provided beneath each bottle for nail repair and brittle nails.
A clear bottle of Manucurist Force Nail Hardener and a white nourishing nail pen are displayed on a light beige background.
Three Manucurist products on a light pink background: Force Nail Hardener in a square bottle, a nail and cuticle serum with a dropper, and a nourishing nail pen in a tube.

FAQs

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

What is a nail hardener and how does it work?

A nail hardener is a treatment designed to strengthen and protect weak, brittle nails. It works by forming a protective layer over the nail that prevents it from breaking or chipping. The formula typically contains strengthening agents that help improve nail resilience. Regular use can lead to visibly stronger nails over time.

Can nail hardener damage my nails?

When used correctly, a nail hardener should not damage your nails. However, overuse or improper application can lead to dryness or brittleness. It’s important to follow the recommended usage guidelines and avoid leaving the product on for too long. If you notice any irritation or adverse effects, discontinue use and consult a professional.

What is the difference between a nail hardener and a nail strengthener?

A nail hardener primarily strengthens nails by forming a hard protective layer that prevents breaking and cracking. In contrast, a nail strengthener works by nourishing and conditioning the nails, helping to restore their natural strength. While both aim to improve nail health, hardeners are more focused on protection, while strengtheners support growth and flexibility.

How do I properly apply a nail hardener for the best results?

To apply a nail hardener effectively, start by ensuring your nails are clean and dry. Apply a thin layer of the hardener to each nail, ensuring even coverage. Allow it to dry completely before applying any additional coats. For optimal results, reapply the hardener as directed and consider using it as a base coat for added protection.

Can I use a treatment base coat as a base coat for my Green™ or Green Flash™ polish?

Treatment base coats can be used as a base coat as part of your Green manicure.

However, they cannot be used instead of a Green Flash™ base coat, which needs to dry under the lamp.

How many coats of treatment base coat do I need to apply?

A single coat is enough.

Can I use a treatment base coat under Green Flash™?

For maximum staying power, we recommend that you only use Green Flash™ Base Coat.

Can treatment base coats be removed with Green Flash™ Nail Polish Remover?

All our treatment base coats can be removed like our polish - with our Nail Polish Remover or Green Flash™ Nail Polish Remover.

If I want to apply more treatment base coat, should I remove the old coat first?

When using a treatment base coat, there's no need to remove the previous coat.

Can pregnant and/or breastfeeding women use your nail care range?

Our nail care formulas are green and clean: they are up to 99% plant-based, i.e. made from biomass ingredients like aloe vera, lemon, ginseng, pomegranate and grape. However, women should avoid all types of nail polish when they are pregnant or breastfeeding. We recommend you speak to a healthcare professional if you are unsure.

Can using your nail care products cause allergies?

Our nail care formulas meet European standards and do not contain any sensitising substances. They are also certified gluten-free and safe for people with gluten intolerance or celiac disease, as are our Green Flash™, Green™ and Active™ ranges. Most customers who are allergic to regular nail care products are not allergic to the Manucurist nail care range. However, as allergic reactions are not specifically linked to chemical ingredients, they can sometimes occur with plant-based ingredients. We recommend you speak to a healthcare professional if you are unsure.

For more information, see our blog on allergies.

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: 4.6596775 / 5 from 620 reviews.

AI Generated Review Summary

The Force Nail Hardener is a fortifying polish designed to strengthen and reinforce soft, thin nails over time. Customers have mixed opinions, with some experiencing stronger and healthier nails. The base coat is highly regarded for its healing properties.

Summary topics

  • Nail Strength (49%): Customers have mixed opinions about this nail hardener, with some experiencing stronger and healthier nails.
  • Base Coat Healing (22%): Based on many customers, the base coat is a great base coat that heals, making it a good base coat.

Review topics: ["color","smell","base","delivery","look","improvement","strength","nails","glow","condition","favorite","polish","oil","quality","finish","coat","difference","treatment","effect","result","application","break","care","hold","protects","shine","hardener","works","change","grow"].

Review highlights

  • "The brush is fabulous, it dries quickly, and my nails feel better after a few uses." — Zoey S.
  • "I love the quality of ingredients and how each is specially targeted to give you the most beautiful and healthy nails." — Antoinette
  • "This nail hardener really worked miracles on my flaking, soft nail." — Janet F.

Reviews

5 stars. My nails were

"5 stars. My nails were all ruined either gel manicure that I did for many years but I stop about 3 years ago. But nails will not grow and I have done damage permanently. Manicurist has returned the hope for me to have more healthy nails again. Not only they are repairing but growing and means the world to me. Thank you so much for making such great product 🙏❤️"

— Patricia E. (5/5)

⭐⭐⭐⭐⭐ Franchement, j’adore vos vernis

"⭐⭐⭐⭐⭐ Franchement, j’adore vos vernis ! ❤️ Les couleurs sont canons, j’en ai plusieurs et je les adore vraiment. Mes vernis préférés… les Green Flash ! La tenue est vraiment top, surtout depuis le nouveau top coat, je trouve que ça tient encore mieux. J’adore pouvoir changer de couleur régulièrement, et avec toutes les teintes que vous avez, il y a vraiment de quoi faire 😍 Bref, je suis fan de vos vernis !"

— Alexandra T. (5/5)

La mejor

"Compré la Base SOS porque mis uñas estaban destrozadas después de una manicura permanente. Más tarde pedí está base y, para mis uñas, es una maravilla. Me gusta incluso más que la Base SOS. Genial como base con los esmaltes Green y como tratamiento. Un básico para mí."

— Nía (5/5)

Buon prodotto. Ma serve un

"Buon prodotto. Ma serve un uso quotidiano per rendere le mie unghie più forti"

— Roberta P. (4/5)

Terrific Strengthening

"This base is by far the best I’ve used. My nails were weak and bendy from overfiling, even using a thin layer of gel base coat wasn’t making them stronger, I had to keep my nails extremely short. In 2 short weeks of using this I have had 0 breaks, I had jammed my finger against a wall and there was very little bend. My nails are finally strong again, even the parts I see that are thin from the filing."

— Jayk (5/5)

Base fortificante

"Le mie unghie risultano più forti e non si piegano come prima"

— Manuela Z. (5/5)

Fantástico, aiuta le mie unghie

"Fantástico, aiuta le mie unghie ad essere più forti."

— Mara C. (5/5)

Très efficace

"Très efficace"

— Giorgia S. (5/5)

The hardener is wonderful. This

"The hardener is wonderful. This is the 1st time in my 69 years that I have been able to have longer, natural nails. Will purchase more of your nail care products in the future."

— Beth M. (5/5)

Hace poco lo uso pero

"Hace poco lo uso pero creo va bien"

— Ana C. (5/5)

Q&A