Manucurist Keratin Booster & S.O.S. Night Mask Nail Kit — 10% Plant Keratin Day Serum + Overnight Repair for Soft or Damaged Nails

Manucurist Duo Day & Night is a two-step nail routine combining a 10% keratin-strengthening day serum and an overnight S.O.S. nail mask to help fortify, hydrate, and restore soft or damaged nails.

This express care set pairs a concentrated Keratin Booster serum formulated to harden and support nail growth with an intensive S.O.S. Nail Mask that works overnight to replenish moisture and protect fragile nail plates. Both formulas are plant-focused and developed to fit into a simple day-and-night schedule for visible nail improvement without replacing your polish routine.

How does the Keratin Booster help fragile nails during the day?

The Keratin Booster is a lightweight serum that delivers a 10% keratin complex plus supportive actives to the nail plate, aiming to reduce splitting and enhance resistance. It absorbs quickly so it won’t interfere with daily tasks or nail polish.

• 10% plant-based keratin concentrated to strengthen nail fibers.
• AHA and gluconolactone for gentle exfoliation of the nail surface.
• Silicon and biotin included to support harder, less breakable nails.
• Fast-drying brush-on formula for 1–3 daily applications.

What does the S.O.S. Night Mask do while you sleep?

The S.O.S. Nail Mask is an overnight treatment that forms a protective film to lock in hydration and repair visible damage. Use it two to three nights a week to help restore flexibility and reduce dryness.

• Thick application creates an insulating barrier on the nail surface.
• Designed to be peeled off or rinsed away the next morning.
• Clinical panel results reported improved hydration and strength after two weeks.
• Complements daily cuticle care for full routine benefits.

How should I use the day-and-night routine for best results?

Apply the Keratin Booster to clean, bare nails one to three times daily. At night, spread a generous layer of the S.O.S. Mask on bare nails two to three times a week; leave to dry and remove the next morning.

• Day: brush serum onto each nail, allow full absorption before activities or applying polish.
• Night: apply mask thickly, let it set, then peel off or wash off in the morning.
• Optional: add a nourishing cuticle oil or pen daily to complete the regimen.
• Consistency for two weeks recommended to assess improvements.

Are these products safe and where are they made?

Manucurist formulates with plant-based keratin and thoughtful ingredient choices to support healthier nails while avoiding harsher alternatives. The Duo Day & Night kit is produced in France as part of the brand’s plant-focused, vegan-conscious nail care line.

• Made in France with plant-sourced keratin.
• Designed to integrate with classic or semi-permanent manicures.
• Suitable for users seeking nail repair without replacing regular polish.

Who is this for? The Manucurist Duo Day & Night kit is ideal for anyone with soft, splitting, or visibly damaged nails who wants a simple, evidence-backed day-and-night program. It suits busy people who need quick-absorbing daytime care and an intensive, low-effort overnight repair step, plus it makes an elegant gift for women who appreciate science-minded, plant-forward beauty.