OUAI Fine Hair Shampoo — Biotin Thickening Shampoo, 10 oz Volumizing & Color-Safe, Sulfate-Free

OUAI Fine Hair Shampoo is a biotin-enriched, lightweight thickening shampoo designed to boost volume, strengthen fragile strands, and cleanse without stripping color or weight.

If your hair looks flat, feels fragile, or loses body between washes, this targeted shampoo blends biotin, hydrolyzed keratin, and chia seed oil to add lift and resilience while staying lightweight. The formula is free of sulfates, parabens, phthalates, and gluten, making it safe for color-, keratin-, or chemically-treated hair. It’s scented with OUAI’s Mercer Street fragrance—Italian lemon, iris, and white musk—so you get a fresh, modern finish as you cleanse.

How does this shampoo actually add volume to fine, limp hair?

OUAI Fine Hair Shampoo uses ingredients that work at the hair fiber level to create measurable body without coating or weighing hair down. Biotin helps reduce breakage over time, keratin smooths and improves manageability, and chia seed oil adds thickness while remaining light.

• Biotin supports stronger strands and fewer snap-offs.
• Hydrolyzed keratin fills and seals cuticles for smoother, shinier hair.
• Chia seed oil increases apparent thickness without heaviness.
• Light surfactants cleanse without stripping natural oils that provide bounce.

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

Yes — the formula is deliberately free of sulfates and common harsh ingredients, so it cleans while protecting salon services. That makes it a sensible choice for anyone who wants fuller-looking hair without compromising color or treatment longevity.

• Sulfate-free to minimize color fade and preserve keratin treatments.
• Paraben- and phthalate-free to reduce exposure to those preservatives.
• Gluten-free for peace of mind for those sensitive to topical gluten.
• Suitable for regular use as part of a volumizing routine.

How should I use OUAI Fine Hair Shampoo for best results?

Apply a small amount to wet roots, work into a gentle lather, then rinse and repeat if needed. Focus on the scalp and roots for lift, then smooth through ends to condition them without adding bulk. For fuller results, follow with OUAI Fine Conditioner and layer OUAI Thickening Spray at the roots.

• Massage into scalp for root lift and circulation.
• Rinse thoroughly to avoid residue that can weigh hair down.
• Pair with Fine Conditioner for lightweight moisture and with Thickening Spray for extra lift.
• Use regularly to reduce breakage and maintain volume over time.

What will I notice after a few washes and long-term use?

After initial use you should feel cleaner, lighter hair with improved texture and more visible body. Over weeks, breakage can decrease and shine improve as keratin and biotin work to strengthen the shaft. Results vary by hair type, but the product is formulated to produce cumulative improvement when used consistently.

• Immediate: fresher scalp, lighter feel, and lifted roots.
• Short term: increased manageability and softer ends.
• Long term: fewer broken strands and fuller-looking volume.
• Scented finish: Mercer Street fragrance adds a refined citrus-floral-musk note.

Who is this for? OUAI Fine Hair Shampoo is aimed at people with naturally fine, thin, or flat hair who want more body without heaviness—this includes those with color-treated, keratin-treated, or chemically processed hair. If you’re seeking a gentle, modern formula that builds lift while strengthening strands and preserving salon results, this lightweight biotin-thickening shampoo fits into daily or frequent routines and pairs well with complementary OUAI volumizing products.

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