Duo Day & Night
- Regular price
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25 € - Regular price
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30 € - Sale price
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25 €
Duo Day & Night
- Regular price
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25 € - Regular price
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30 € - Sale price
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25 €
- Play video
The day & night routine for soft, damaged nails, an express treatment to strengthen and regenerate. This routine includes:
- The Keratin Booster, a 10% concentrated treatment to instantly repair fragile nails
- The S.O.S. Mask, an overnight care treatment to intensely hydrate nails
What is your nail type? Take our diagnostic test by clicking here to find out!
Nail types:Damaged and Soft
Free delivery from €39
Pay in 3 interest-free instalments (orders over €80)
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Nail Strengthening Serum

- Regular price
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15 € - Regular price
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- Sale price
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15 €
Strengthens and regenerates soft, damaged nailsHardens -
S.O.S. Mask

- Regular price
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15 € - Regular price
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- Sale price
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15 €
Regenerating and hydrating night maskRegenerates
Description
The day & night routine
7 days to visibly repair soft and damaged nails, thanks to the combined action of two expert treatments
Day treatment - The Keratin Booster:
The miracle hardening treatment that instantly strengthens and regenerates soft and damaged nails.
Concentrated 10% treatment 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 strengthen 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*
Its fluid texture is immediately absorbed, with no greasy or sticky finish.
*Clinical test under dermatological control on 25 people after 2 weeks of application.
Night treatment - The S.O.S. Mask:
The night mask intensely hydrates very damaged nails. Its unique formula, highly concentrated in emollient and strengthening agents, forms a protective film on the nail surface to stimulate cell repair.
Proven visible results:
- 80% find their nails more hydrated**
- 75% find their nails harder**
- 75% find their nails stronger**
**Test conducted on a panel of 20 people over 14 days.
How to use the Day & Night routine?
Your 7-day treatment to repair soft, damaged nails:
- Day care : On bare nails, apply the Keratin Booster 1 to 3 times a day using the brush. Let dry until fully absorbed.
- Night care : On bare nails, apply the S.O.S. Mask 2 to 3 nights a week in a thick layer. Let air dry. The next morning, peel off or remove with soapy water.
Ingredients / INCI
Keratin Booster:
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*
S.O.S. Mask:
AQUA (WATER), ALCOHOL DENAT., POLYVINYL ALCOHOL, PANTHENOL, PARFUM (FRAGRANCE), ALCOHOL, TRIS(TETRAMETHYLHYDROXYPIPERIDINOL) CITRATE, CI 14700 (RED 4)
80.5% ingredients of natural origin*
*Calculation based on the international ISO 16128 standard.
Pro tip ✨
To complete the routine, nourish cuticles daily with the Perfecting Concentrate.








The day & night routine for soft and damaged nails
Strengthens and regenerates
nailsRepairs nails
fragileDeeply hydrates
nails
How to use the Day & Night Routine?
Ideal for soft and damaged nails
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Apply Keratin Booster 3 times a day
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Apply the S.O.S. Mask in the evening every 3 days
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The next morning, peel off the mask
FAQ
The most frequently asked questions from our users and community!
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 talk about us!
Reviews are collected 28 days after purchase and are from verified buyers only.
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Free delivery Free delivery to a pick-up point from €39 and to your door from €49. Valid in Metropolitan France.
Free delivery
Free delivery to a pick-up point from €39 and to your door from €49. Valid in Metropolitan France.
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3 interest-free instalments
Or pay by credit card, Paypal, Amazon Pay, Apple Pay, Bancontact, iDEAL, SOFORT, Giropay.
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Loyalty programme By becoming a Green Addict member, earn points and enjoy many exclusive perks!
Loyalty programme
By becoming a Green Addict member, earn points and enjoy many exclusive perks!
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Click & Collect Your order ready within 2 working hours in Paris, Tuesday to Saturday, 12pm–7pm.
Click & Collect
Your order ready within 2 working hours in Paris, Tuesday to Saturday, 12pm–7pm.
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