Nécessaire Rosemary Leave-In Mask 60 ml — Keratin Strengthening, Color-Safe Weekly Treatment

This concentrated 60 ml leave-in mask blends rosemary extract with 5% vegan keratin to deliver immediate silkiness and cumulative repair for damaged or stressed strands. Designed for use on all hair types and textures, the formula is free from sulfates, silicones, parabens, PEGs and phthalates, making it suitable for color-treated hair and sensitive scalps. It pairs a light rosemary-led scent with mandarin, jasmine and cedar for a refined, calming aroma.

How quickly will I notice smoother, more manageable hair?

Most users see immediate tactile changes: reduced frizz, softer texture and easier detangling after the first application. Deeper structural benefits, like increased strand resilience, build with regular weekly use as the 5% vegan keratin supports fiber reinforcement over time.

• Instant: visible softness and improved slip when applied to damp hair.
• With use: progressive reduction in breakage and split ends.
• Weekly timing: designed as a targeted weekly treatment rather than a daily conditioner.

How do I use the mask for best results without weighing hair down?

Apply sparingly to towel-dried mid-lengths and ends—avoid the roots if you have fine hair. Leave in; do not rinse. Style as usual. For thicker or coarser textures, slightly more product may be used to ensure even distribution.

• Start with a pea- to nickel-sized amount, increase by hair length/thickness.
• Distribute with fingers or a wide-tooth comb for even coverage.
• No rinse: the formula is designed to remain in the hair to continue strengthening.

What ingredients make this a strengthening treatment rather than a basic conditioner?

Two key actives set it apart: rosemary extract and a 5% vegan keratin complex. Rosemary supports the appearance and condition of strands, while vegan keratin supplies amino-acid–like building blocks to help reinforce weakened fiber and reduce breakage.

• Rosemary extract: helps smooth and enhance silkiness immediately.
• 5% vegan keratin: targets structural improvement and resilience.
• Free-from list: formulated without sulfates, silicones, parabens, PEGs, or phthalates.

Is the Rosemary Leave-In Mask safe for color-treated or sensitive scalps?

Yes—the formula is color-safe and dermatologist-tested, labeled hypoallergenic and non-comedogenic. It omits common harsh additives that can strip color or irritate sensitive skin, making it suitable for those seeking gentler repair options.

• Color-safe: does not contain harsh sulfates that accelerate color fade.
• Dermatologist-tested: hypoallergenic, non-comedogenic labeling.
• Mild fragrance: rosemary with mandarin, jasmine and cedar for a subtle scent experience.

Who is this for: The Nécessaire Rosemary Leave-In Mask suits anyone wanting a targeted, leave-in rebuilding treatment—people with chemically or heat-damaged hair, those wanting to protect color, and anyone seeking immediate smoothness plus long-term strengthening. It is formulated for both women and men and adapts to fine, medium and coarse textures when applied according to hair density.

Ingredients

Water/Eau/Aqua Propanediol Cetearyl Alcohol Keratin Amino Acids Glyceryl Stearate Rosmarinus Officinalis (Rosemary) Leaf Oil Rosmarinus Officinalis (Rosemary) Leaf Water Rosmarinus Officinalis (Rosemary) Leaf Extract Hydrolyzed Moringa Oleifera Seed Extract Hydrolyzed Jojoba Protein Hydrolyzed Rice Protein Hydrolyzed Pea Protein Hydrolyzed Quinoa Hydrolyzed Vegetable Protein Ceramide AG Ceramide AP Ceramide EOP Ceramide NP Ceramide NG Tocopherol Acetyl Tetrapeptide-3 Biotin Niacinamide