OUAI Fine Hair Shampoo — Thickening Shampoo for Thin, Color-Treated Hair (32 oz) with Biotin & Keratin

Designed for fine, chemically treated, or color-treated hair, this large-format shampoo uses biotin, hydrolyzed keratin, and chia seed oil to gently cleanse while improving body and reducing breakage. The formula is free of sulfates, parabens, phthalates, and gluten, and carries OUAI’s Mercer Street fragrance—a blend of Italian lemon, iris, and white musk—so your hair feels fresh and light after every wash.

How does OUAI Fine Hair Shampoo add volume without heaviness?

The shampoo combines lightweight botanicals and targeted proteins that temporarily thicken the hair shaft and lift roots. It cleanses oils and product buildup that can flatten fine hair, leaving hair fuller and bouncier from root to tip.

• Biotin helps strengthen strands to reduce breakage.
• Hydrolyzed keratin smooths cuticles for visible gloss without weight.
• Chia seed oil provides thickness and softness while remaining lightweight.
• Gentle surfactants remove residue without stripping natural moisture.

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

Yes — the formula is gentle and safe for color-treated, keratin-treated, and otherwise chemically processed hair. It avoids harsh sulfates and parabens that can accelerate color fade or degrade treatments.

• Sulfate-free base preserves color vibrancy longer.
• No parabens or phthalates for milder daily use.
• Suitable for routine use with professional treatments.

How should I use this salon-size bottle for best results?

Apply to wet hair, focusing first on the scalp and roots, then emulsify and work through to the ends. Rinse and follow with OUAI Fine Conditioner to lock in volume and finish with OUAI Thickening Spray when styling for extra lift.

• Use a quarter-sized amount for medium-length hair; adjust as needed.
• Massage into roots for lift, through mid-lengths for even cleansing.
• Pair with OUAI Fine Conditioner and styling products for full routine benefits.

What sensory experience and scent can I expect from this shampoo?

The texture is lightweight and lathers easily, rinsing clean without residue. It features OUAI’s Mercer Street fragrance—citrusy top notes of Italian lemon balanced by floral iris and a comforting white musk base—for a fresh, modern scent in the shower.

• Light lather that rinses out without build-up.
• Mercer Street fragrance: lemon, iris, and white musk.
• Leaves hair smelling fresh and feeling airy, not sticky.

Who is this for: OUAI Fine Hair Shampoo 32oz is ideal for people with fine, limp, or thinning hair who want a gentle, salon-sized option that boosts body and reduces breakage. It’s suited to anyone maintaining color or chemical treatments who needs a lightweight, everyday thickening shampoo with a pleasant fragrance and professional-strength ingredients.

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