OUAI Scalp Serum — Balancing hair serum 2 fl oz, hyaluronic acid & peptides for hydrated, fuller-looking hair

OUAI Scalp Serum is a lightweight, skin care–inspired serum formulated to balance the scalp and support thicker, fuller-looking hair.

This serum blends hyaluronic acid, adaptogens like Siberian ginseng and red clover extract, and a peptide complex to hydrate the scalp, calm irritation, and create conditions that help hair appear fuller. The formula is free from parabens, phthalates, and sulfates and carries OUAI’s Cape Town scent — a subtle herbal-fig aroma with spearmint and ginger notes. Designed for everyday use, the product targets scalp health as the foundation for better hair texture and manageability.

How does this serum improve scalp hydration and comfort?

The serum delivers a hyaluronic-acid-rich base that attracts and holds moisture at the skin level, while adaptogenic botanicals help soothe and balance. Its lightweight texture absorbs quickly without leaving a greasy residue, making it suitable for daily application.

• Hyaluronic acid to lock in moisture at the scalp
• Chaga mushroom and Arctic root to help calm and fortify skin
• Fast-absorbing oil-blend that avoids weigh-down

Can this help hair look thicker or fuller?

The serum contains peptides and red clover extract intended to support a healthier scalp environment, which can make hair strands appear denser over time. While results vary, regular use aims to improve the look of fullness by supporting the hair’s base and reducing visible dullness or dryness.

• Peptide complex to support scalp resilience and shine
• Red clover extract as a botanical supportive ingredient
• Daily application recommended for best cosmetic benefits

How do I use OUAI Scalp Serum in my routine?

Use the included applicator to apply the serum directly to the scalp on dry or damp hair, sectioning hair as needed. Gently massage for a minute to distribute; leave on — there’s no rinse required — and style as usual. Consistent use integrates easily into morning or evening routines.

• Apply to sections for even coverage across the scalp
• Massage briefly to promote even absorption
• Use daily for ongoing maintenance; no rinse needed

Is this product suitable for all hair types and concerns?

Formulated to be lightweight and noncomedogenic, the serum is designed to work with a wide range of hair textures and concerns, from fine to coarse and natural to chemically treated. It avoids harsh sulfates and common irritants to minimize the chance of buildup or increased oiliness.

• Safe for fine, medium, and thick hair types
• Works with color-treated and chemically processed hair
• Paraben-, phthalate-, and sulfate-free formulation

Who is this for: OUAI Scalp Serum is aimed at anyone who wants to prioritize scalp health as part of their haircare routine — especially people experiencing dryness, occasional discomfort, or seeking a cosmetic boost in hair fullness. It's also a good pick for users who prefer lightweight, fragrance-forward products made without common harsh additives and who want a simple, daily step to support healthier-looking hair.

Ingredients

Aqua / Water / Eau, Polysorbate 20, Butylene Glycol, Glycerin, Polyquaternium-7, Rhodiola Rosea Extract, Sodium Hyaluronate, Tocopheryl Acetate, Acetyl Tetrapeptide-3, Tocopherol, Rosa Centifolia Flower Extract, Dextran, Trifolium Pratense (Clover) Flower Extract, Acanthopanax Senticosus (Eleuthero) Root Extract, Rhaponticum Carthamoides Root Extract, Inonotus Obliquus (Mushroom) Extract, Selaginella Lepidophylla Extract, Ethylhexylglycerin, Disodium Edta, Sodium Hydroxide, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Citric Acid, Sodium Benzoate, Phenoxyethanol, Fragrance / Parfum, Eugenol, Limonene, Linalool.