Manucurist Duo Day & Night Nail Strengthener Kit — 10% Keratin Booster & Overnight S.O.S. Mask for Brittle Nails

Manucurist Duo Day & Night Nail Strengthener Care Kit is a two-step routine combining a 10% keratin booster serum for daytime strengthening with an overnight S.O.S. nail mask to hydrate and protect damaged nails.

This compact kit pairs an express daytime keratin concentrate with an intensive overnight mask to help nails look and feel more resilient. Designed as a simple day-and-night regimen, the two products work on the nail plate to support hardness, hydration, and surface repair. Formulated with plant-based keratin, AHA and gluconolactone exfoliators, silicon and biotin, the system targets soft, brittle or split-prone nails without the need for complicated steps.

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

The Keratin Booster is a concentrated serum (10% keratin) intended for frequent daytime application to harden and regenerate weakened nails. It absorbs quickly so you can continue your routine and can be applied directly on bare nails 1–3 times daily.

• 10% plant-based keratin concentrate for increased surface strength.
• AHA and gluconolactone to gently exfoliate the nail plate.
• Silicon and biotin to support nail structure and appearance.
• Quick-drying brush application—no polish base required.

What does the S.O.S. Nail Mask do overnight?

The S.O.S. Nail Mask is an intensive overnight treatment that creates a protective film to lock in moisture and reinforce very dry or damaged nails. Use it 2–3 nights a week in a thick layer and remove by peeling or washing the next morning for an immediate hydrating effect.

• Thick, peel-off or washable mask for concentrated hydration.
• Forms a protective film to prevent further moisture loss.
• Designed for intermittent use—2–3 nights weekly for repair cycles.
• Tested in short-term panels showing improved hydration and strength.

How do you combine both products in a simple day & night routine?

Use the Keratin Booster on clean, bare nails during the day and reserve the S.O.S. Mask for evening treatments. The routine is low-effort: apply the serum as needed throughout the day and a mask session before bed for cumulative benefits.

• Day: Apply Keratin Booster 1–3 times to bare nails; let fully absorb.
• Night: Apply S.O.S. Mask 2–3 nights per week in a thick layer; let dry.
• Morning: Remove mask by peeling or washing with soap and water.
• Optional: Add a cuticle nourishing oil daily for best results.

Who is this kit for? The Manucurist Duo Day & Night Nail Strengthener Care Kit is aimed at people with soft, brittle or damaged-looking nails who want a straightforward, two-step regimen to strengthen and hydrate without salon appointments. It appeals to anyone seeking plant-based, vegan-friendly nail care made in France and is suitable for those who prefer an express daytime serum plus an occasional overnight restorative treatment.