Nécessaire Rosemary Serum for Fuller, Denser Hair — 1 fl oz | 70% Rosemary & 5% Capixyl™, Quick-Dry, No Residue

Nécessaire Rosemary Serum is a clear, quick-dry leave-in scalp serum formulated with 70% rosemary (water, oil, extract) and 5% Capixyl™ to support denser, fuller, healthier-looking hair with daily use.

This lightweight, non-greasy formula was created to be added to your everyday hair routine: the fast-absorbing texture leaves no residue, dries quickly, and layers under styling products without weighing hair down. The ingredient blend combines concentrated rosemary components with Capixyl™, plant-derived proteins and essential ceramides to nourish the scalp and hair strands while avoiding silicones, phthalates, parabens and PEGs. Dermatologist-tested and certified vegan, the serum has a pure rosemary scent—distinct from Nécessaire’s shampoo and conditioner fragrances.

How will this serum fit into my daily hair routine?

Apply the serum directly to a clean, dry or towel-dried scalp once daily for best results as part of your regular hair care ritual. A few targeted drops evenly distributed across thinning or high-part areas help the lightweight formula absorb quickly and layer with other styling and leave-in products.

• Use daily on clean, damp or dry scalp.
• Dispense small drops and part hair to apply to root areas.
• Massage gently to distribute; no rinsing required.
• Compatible with color-treated and chemically-treated hair.

What key ingredients are inside and what do they do?

The serum centers on 70% rosemary (water, oil, extract) plus 5% Capixyl™, supported by plant proteins and essential ceramides to help strengthen the scalp environment and support visible hair fullness. The formula avoids harsh additives, relying on targeted actives and lightweight carriers for fast absorption without buildup.

• 70% rosemary water, oil and extract for concentrated botanical support.
• 5% Capixyl™ to help improve the appearance of hair density.
• Plant proteins and ceramides to support hair structure and scalp integrity.
• No silicones, phthalates, parabens or PEGs; vegan and cruelty-free.

Will it leave my hair sticky or interfere with styling?

The serum dries quickly into a clear, non-sticky finish that won’t leave visible residue or weigh hair down, making it easy to style after application. Because it’s lightweight and non-comedogenic, it layers under oils, creams, and heat-styling products without altering hold or texture.

• Clear, quick-dry formula with no visible residue.
• Non-greasy and non-comedogenic for comfortable daily use.
• Safe to combine with your existing styling products and tools.
• Color-safe and dermatologist-tested for sensitive scalps.

How long before I can expect to notice changes?

Individual results vary; consistent application is important. The product is designed for daily use to support the appearance of fuller, healthier-looking hair over time rather than immediate structural changes.

• Apply once daily for best results.
• Visible improvements are gradual and depend on consistent use.
• Follow routine with gentle cleansing and targeted hair care.

Who this is for: Nécessaire Rosemary Serum is formulated for anyone—women and men—looking to support the appearance of denser, fuller hair without heavy oils or residue. It’s suitable for color-treated and sensitive scalps, and for people seeking a vegan, dermatologist-tested leave-in treatment free from silicones, parabens, phthalates and PEGs. Those wanting a daily, fast-drying scalp solution with a natural rosemary scent will find it fits seamlessly into their grooming routine.

Ingredients

"Rosmarinus Officinalis (Rosemary) Leaf Water, Propanediol, Butylene Glycol, Aqua/Water/Eau, Rosmarinus Officinalis (Rosemary) Leaf Oil, Rosmarinus Officinalis (Rosemary) Leaf Extract, Hydrolyzed Jojoba Protein, Hydrolyzed Rice Protein, Hydrolyzed Pea Protein, Hydrolyzed Quinoa, Hydrolyzed Vegetable Protein, Ceramide AG, Ceramide AP, Ceramide EOP, Ceramide NG, Ceramide NP, Acetyl Tetrapeptide-3, Niacinamide, Panthenol, Trifolium Pratense (Clover) Flower Extract, Glycerin, Dipropylene Glycol, Sucrose Distearate, Glyceryl Stearate, Cholesterol, Hydrogenated Lecithin, 1,2-Hexanediol, Citric Acid, Caprylhydroxamic Acid, Dextran, Potassium Sorbate, Sodium Benzoate, Phenoxyethanol, Limonene, Linalool, Pinene, Camphor, Terpineol, Beta-Caryophyllene Note: Ingredients are subject to change at the manufacturer's discretion. For the most complete and up-to-date list of ingredients, refer to the product packaging."