OUAI Fine Hair Shampoo — Biotin Thickening Shampoo for Thin Hair, 10 fl oz, Sulfate-Free Volume Boost

OUAI Fine Hair Shampoo is a biotin-enriched thickening shampoo designed to gently cleanse and add lasting volume to fine or thin hair without weighing it down.

Formulated to boost body and reduce breakage, this sulfate- and paraben-free shampoo uses biotin, hydrolyzed keratin, and chia seed oil to strengthen strands and create visible lift from root to tip. It’s safe for color-treated and chemically processed hair and arrives in OUAI’s Mercer Street fragrance, a light blend of Italian lemon, iris, and white musk. Use alone for noticeable bounce or layer with OUAI Fine Conditioner and OUAI Thickening Spray for intensified volume and hold.

How does this shampoo add volume without making hair feel heavy?

OUAI Fine Hair Shampoo combines lightweight thickeners and strengthening ingredients that coat and plump individual strands rather than saturating hair with heavy oils. The result is fuller-looking hair with natural movement and no greasy residue.

• Biotin: supports strand resilience to reduce breakage.
• Hydrolyzed keratin: smooths cuticles for reflective shine and body.
• Chia seed oil: thickens fiber without weighing it down.
• Sulfate-free cleansing: lifts dirt and styling buildup gently.

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

Yes — the formula is free from sulfates, parabens, phthalates, and gluten, making it compatible with color-treated, keratin-treated, and chemically processed hair. It cleanses effectively while respecting treated strands so color and treatments last longer.

• Safe for dyed and highlighted hair.
• No harsh sulfates that strip pigments.
• Gentle enough for routine use on processed hair.

How should I use this shampoo for best results?

Apply a small amount to wet hair, massage into the scalp to activate the thickening agents, then work through mid-lengths to ends and rinse. For fuller results, follow with OUAI Fine Conditioner and finish with OUAI Thickening Spray at the roots.

• Focus massage at roots to encourage lift.
• Rinse thoroughly to avoid buildup that can flatten hair.
• Pair with complementary OUAI products for layered volume.

What does OUAI Fine Hair Shampoo smell like and how long does the scent last?

The shampoo carries OUAI’s Mercer Street fragrance, a fresh, modern scent featuring Italian lemon, iris, and white musk. The fragrance lingers subtly after rinse and layers nicely with OUAI styling products for a cohesive scent profile throughout the day.

• Top notes: bright Italian lemon.
• Heart: soft iris for a powdery floral lift.
• Base: clean white musk for lasting warmth.

Who is this for? OUAI Fine Hair Shampoo is formulated for anyone with fine, limp, or thinning hair who wants a lightweight, daily-use cleanser that increases body and reduces breakage without sacrificing shine. It’s ideal for people who color or chemically treat their hair and who prefer clean, cruelty-free formulations with modern fragrance. If you’re building a volumizing routine, this shampoo serves as the foundational step to add lift, strengthen strands, and create canvas-ready hair for styling.

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