OUAI Scalp Serum — Balancing Hair & Scalp Treatment, 2 fl oz | Hyaluronic Acid & Peptides for Fuller-Looking Hair

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

This serum treats the scalp like skin: it targets hydration, comfort and barrier support to create conditions that help hair appear thicker and more resilient. Designed for daily use on all hair types, it blends adaptogens and peptides in a non-greasy base and carries OUAI’s Cape Town scent — a fresh, earthy mix of spearmint, ginger, basil and green fig.

How does this serum improve scalp hydration and comfort?

The formula combines hyaluronic acid with nourishing adaptogens like Arctic root and chaga mushroom to help deliver and retain moisture at the scalp surface. Lightweight emollients make the serum feel smooth without weighing hair down, so it can be applied daily.

• Hyaluronic acid for moisture retention
• Adaptogens (Siberian ginseng, Arctic root) to support scalp resilience
• Non-greasy texture suitable for daily use

What ingredients support thicker, fuller-looking hair?

The serum combines peptides and red clover extract alongside hydrating and botanical ingredients to help create a healthier scalp environment where hair can look denser. These actives focus on nourishment and barrier support rather than altering hair growth claims.

• Peptides to help fortify the scalp environment
• Red clover extract for botanical support
• Chaga mushroom and adaptogens for scalp balance

How do I use OUAI Scalp Serum in my routine?

Apply the serum directly to the scalp on clean, towel-dried or dry hair, massaging gently to spread evenly. Use daily for best results and follow with styling or leave-in products as usual; the lightweight formula layers well under other treatments.

• Apply a few drops to scalp sections or along hair partings
• Massage for 30–60 seconds to distribute product
• Use daily or as needed for dryness or sensitivity

Is this serum free from harsh additives and suitable for sensitive scalps?

OUAI formulates this scalp serum without parabens, phthalates and sulfates, focusing on gentle, skin-friendly ingredients. While designed for broad compatibility, perform a patch test if you have a known sensitivity to botanical extracts or fragrances.

• Paraben-, phthalate- and sulfate-free
• Contains fragrance (Cape Town scent) — patch test recommended
• Intended for all hair types, including color-treated hair

Who is this for? Anyone wanting a daily, lightweight scalp treatment that prioritizes hydration, comfort and a healthier scalp environment. It’s suited to people with dry, irritated or flaky scalps, those seeking a product to support fuller-looking hair, and users who prefer formulas free of common harsh additives. If you want a simple, sinkside step that layers under styling products and delivers a non-greasy finish, OUAI Scalp Serum is designed to fit into everyday hair care routines.

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.