OUAI Fine Hair Shampoo — Biotin Thickening Shampoo 10 oz, Lightweight Volumizing & Strengthening with Keratin

OUAI Fine Hair Shampoo is a lightweight, biotin-enriched thickening formula designed to add durable volume and reduce breakage without weighing down fine or flat hair.

This shampoo combines biotin, hydrolyzed keratin, and chia seed oil in a sulfate-free base to lift roots, strengthen strands, and preserve color and chemical treatments. It cleanses gently while delivering texture and shine, making it a daily option for anyone who wants fuller-looking hair without heavy residues. The scent profile—Mercer Street with Italian lemon, iris, and white musk—gives a subtle, sophisticated finish that layers well with the rest of OUAI’s styling range.

How does this shampoo add volume without weighing hair down?

OUAI Fine Hair Shampoo uses lightweight botanicals and proteins that boost thickness at the shaft and root while keeping the formula free of heavy oils and sulfates. The combination lifts hair at the scalp and creates a fuller appearance along each strand, so volume feels natural rather than stiff.

• Biotin to support thicker-looking hair and less breakage
• Hydrolyzed keratin to smooth and add shine without heaviness
• Chia seed oil for lightweight conditioning and improved texture
• Sulfate-free surfactants for gentle cleansing that preserves volume

Is this shampoo safe for color-treated or chemically processed hair?

Yes—this formula is designed to be color-safe and gentle on chemically treated hair, including keratin or smoothing services. It avoids sulfates, parabens, phthalates, and gluten, helping protect color vibrancy and treatment integrity day to day.

• Free from sulfates and parabens
• Compatible with color, keratin, and chemical treatments
• Formulated to minimize stripping and fading

How should I use it for the best thickening effect?

Apply to wet hair, focusing first on the roots and then working through to the ends to evenly distribute active ingredients. Rinse and follow with OUAI Fine Conditioner to lock in lift and moisture; add OUAI Thickening Spray on damp hair for extra lift and lasting body.

• Massage into roots to encourage lift
• Work through mid-lengths and ends for balanced conditioning
• Pair with OUAI Fine Conditioner and Thickening Spray for maximum volume

What styling benefits and scent does this shampoo provide?

Beyond cleansing and thickening, the shampoo smooths cuticles for shine and reduces breakage for stronger-feeling hair. Its Mercer Street fragrance layers citrusy Italian lemon with iris and white musk for a clean, modern scent that complements OUAI’s hair and body collection.

• Improves manageability and adds visible shine
• Helps reduce breakage and split ends with strengthening ingredients
• Mercer Street scent for a subtle, lasting fragrance experience

Who is this for: OUAI Fine Hair Shampoo is ideal for men and women with fine, limp, or thinning hair who want daily volume, gentle cleansing, and support for color- or chemically-treated hair. It fits routines focused on lightweight lift, breakage reduction, and a refined scent, and performs best when combined with the matching Fine Conditioner and styling products from OUAI.

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