OUAI Fine Hair Shampoo — Biotin Thickening Shampoo for Thin Hair (296 ml) | Sulfate-Free, Weightless Volume

OUAI Fine Hair Shampoo is a biotin-enriched, sulfate-free thickening shampoo designed to add weightless volume, reduce breakage, and gently cleanse fine or thinning hair.

This lightweight shampoo targets limp, fine hair by combining biotin, hydrolyzed keratin, and chia seed oil to create fuller-looking strands without leaving residue. Formulated free of sulfates, parabens, phthalates, and gluten, it’s safe for color- and chemically treated hair and carries the signature Mercer Street scent with Italian lemon, iris, and white musk. Use as the foundation of a volumizing regimen alongside OUAI Fine Conditioner and OUAI Thickening Spray for best results.

How does OUAI Fine Hair Shampoo give my hair more volume?

The formula uses biotin to support stronger strands while chia seed oil and hydrolyzed keratin create the appearance of thicker, fuller hair. It cleanses roots and hair without heavy silicones that can flatten fine hair, so lift from the scalp lasts longer after styling.

• Biotin strengthens strands to reduce breakage and boost body.
• Hydrolyzed keratin smooths and increases visible thickness.
• Weightless chia seed oil plumps without residue.
• Sulfate-free surfactants preserve natural texture and lift.

Will this shampoo work on color-treated or chemically processed hair?

Yes — the formula is gentle and free from sulfates and harsh cleansing agents that can strip color or disrupt professional treatments. It cleans effectively while maintaining the integrity of color, keratin treatments, and other chemical processes.

• Sulfate-, paraben-, phthalate-, and gluten-free for safer use on treated hair.
• Non-stripping cleaners help retain color vibrancy and treatment longevity.
• Pairing with OUAI Fine Conditioner helps lock in moisture without weighing hair down.

How should I use this shampoo for the best thickening effect?

Massage a small amount into wet roots, then work the lather through to the ends to evenly distribute actives. Rinse and follow with OUAI Fine Conditioner; for extra lift, finish with OUAI Thickening Spray at the roots before blow-drying.

• Apply to wet hair, focus on the scalp and roots for lift.
• Rinse thoroughly and condition mid-lengths to ends only.
• Use regularly as part of a volumizing routine for visible body over time.

What sensory experience and fragrance does this shampoo have?

OUAI Fine Hair Shampoo offers a light, modern scent profile named Mercer Street, blending bright Italian lemon, soft iris, and clean white musk. The texture is lightweight and rinses clean, leaving hair with tactile bounce and a subtle fragrance that layers well with other OUAI products.

• Mercer Street scent: Italian lemon, iris, white musk.
• Light, non-greasy texture that rinses without residue.
• Designed to complement OUAI styling products without scent clash.

Who is this for: OUAI Fine Hair Shampoo is ideal for people with fine, limp, or thinning hair who want noticeable lift and reduced breakage without heavy ingredients. It’s a good match for anyone using color treatments, keratin services, or regular styling who needs a gentle, volumizing cleanser that plays well with other haircare steps.

Ingredients

Water/Aqua/Eau, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl Cocoyl Taurate, Peg-200 Hydrogenated Glyceryl Palmate, Cocamide Mipa, Fragrance / Parfum, Panthenol, Cocoglucosides Hydroxypropyltrimonium Chloride, Hydrolyzed Keratin, Biotin, Salvia Hispanica Seed Oil, Cetrimonium Chloride (Anti-Static Agent/Agent Antistatique), Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Glycerin, Sodium Lauroyl Glycinate, Peg-150 Distearate, Propoxytetramethyl Piperidinyl Dimethicone, Trideceth-6, C11-15 Pareth-7, Peg-7 Glyceryl Cocoate, Sodium Chloride, Polyquaternium-7, Disodium Edta, Citric Acid, Sodium Hydroxide, Tetrasodium Edta, Potassium Sorbate, Sodium Benzoate, Phenoxyethanol, Benzyl Alcohol, Acetic Acid, Sodium Acetate, Benzyl Salicylate, Limonene, Hexyl Cinnamal