OUAI Scalp Serum lightweight balancing scalp treatment, 2 fl oz — hyaluronic acid & peptides for fuller-looking hair

OUAI Scalp Serum is a lightweight, skin-care–inspired scalp treatment formulated with red clover, Siberian ginseng, peptides and hyaluronic acid to hydrate the scalp and support thicker, fuller-looking hair.

This serum treats the scalp like skin: it creates a balanced, hydrated environment that helps hair look fuller and feel healthier. Designed for daily use, the formula combines adaptogens, humectants and peptides while remaining free of parabens, phthalates and sulfates. Its signature Cape Town scent—bright spearmint with earthy basil and green fig—offers a calming ritual during application.

How does this serum improve scalp hydration and comfort?

The formula uses hyaluronic acid to attract and bind moisture at the scalp surface while adaptogens such as Arctic root and chaga mushroom help support the scalp’s natural resilience. Lightweight oils and humectants reduce tightness and flaking without weighing hair down.

• Hyaluronic acid for moisture retention
• Arctic root & Siberian ginseng to support scalp vitality
• Non-greasy absorption for use on any hair type
• Free of parabens, phthalates and sulfates for gentler care

What ingredients contribute to fuller-looking hair?

Peptides work with the serum’s supportive botanical blend to create the appearance of thicker, more voluminous hair over time. Red clover and targeted adaptogens nourish the scalp environment, helping strands appear more substantial without heavy styling products.

• Peptides that support strand strength and density appearance
• Red clover extract for botanical support
• Adaptogens to promote a balanced scalp ecosystem
• Lightweight base that preserves natural hair movement

How do you use OUAI Scalp Serum in a routine?

Apply directly to the scalp daily or as needed on clean, dry or damp hair. A few drops massaged into areas of concern distributes the serum evenly; no rinse required. Use before styling to maintain hydration without altering hold or texture.

• Dispense a few drops along the scalp parting
• Gently massage to promote absorption and circulation
• Use daily for best maintenance results
• Works with all styling products and routines

Will this serum work for my hair type and concerns?

OUAI designed this product to be inclusive of all hair textures and densities. Because it targets the scalp rather than the hair shaft alone, it’s suitable for fine, medium or thick hair that needs improved hydration, comfort and the look of fullness.

• Safe for curly, straight, fine or coarse hair
• Non-comedogenic, lightweight finish for everyday wear
• Paraben-, phthalate- and sulfate-free formulation
• Blendable with serums, oils or leave-in treatments

Who is this for: anyone seeking a practical, everyday scalp treatment that supports hydration and the appearance of fuller hair without heavy residue. It’s aimed at people who prefer skin-care-inspired solutions, those addressing dryness or discomfort at the scalp, and anyone who wants a simple step to add to morning or nightly hair care rituals. OUAI Scalp Serum fits into clean-minded routines and is formulated to be easy to use for both beginners and seasoned hair-care fans.

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.