OUAI Fine Hair Biotin Thickening Shampoo 10 fl oz — Lightweight Volume & Strength for Thin, Color-Treated Hair

OUAI Fine Hair Shampoo is a biotin-enriched thickening shampoo that adds lift, body, and strength to thin, fragile hair without weighing it down.

Designed for fine or limp hair, this 10 fl oz formula combines biotin, hydrolyzed keratin, and chia seed oil to create fuller-looking strands while gently cleansing. It’s free of sulfates, parabens, phthalates, and gluten, and formulated to be safe on color-treated or chemically processed hair. The fragrance-forward Mercer Street scent layers Italian lemon, iris, and white musk for a salon-fresh finish.

How does OUAI Fine Hair Shampoo add volume without heaviness?

This shampoo focuses on lightweight volumizing ingredients that lift at the root and thicken the strand without coating or weighing hair down. Its blend of biotin and chia seed oil targets fine hair specifically to create noticeable bounce and manageability.

• Biotin supports thicker-feeling strands and reduces breakage during styling.
• Chia seed oil provides body while staying light on the hair cuticle.
• Hydrolyzed keratin smooths and adds shine without residue.
• Gentle, non-stripping surfactants preserve natural movement.

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

Yes — the formula was developed to be gentle on treated hair while still delivering volume. It avoids harsh sulfates and parabens that can accelerate color fade, so you can maintain vibrancy alongside added body.

• Sulfate-free cleansing minimizes color stripping and dryness.
• Safe for keratin-treated and chemically processed hair types.
• Pairs well with color-care conditioners to preserve tone and moisture.

How should I use it for best results in my daily routine?

Work the shampoo into a lather at the roots, gently massaging to lift and clarify, then run through to the ends before rinsing. For a full-thickness routine, follow with OUAI Fine Conditioner and finish with OUAI Thickening Spray for targeted lift.

• Apply primarily to roots for maximum lift; distribute to ends for cleansing.
• Use daily or as needed depending on scalp oil and styling schedule.
• Combine with OUAI Fine Conditioner to detangle and lock in volume.
• Layer OUAI Thickening Spray on damp hair for extra texture and hold.

What kind of scent and sensory experience does it provide?

OUAI Fine Hair Shampoo features the Mercer Street fragrance line: a bright citrus opening notes of Italian lemon softened by floral iris and anchored with white musk. The scent is designed to feel modern and transportive — noticeable but never overpowering.

• Top notes: Italian lemon for an uplifting opening.
• Heart notes: iris adds a soft, powdery floral character.
• Base notes: white musk for a clean, long-lasting finish.
• Light, smooth lather that rinses clean without residue.

Who this is for: OUAI Fine Hair Shampoo is ideal for people with fine, limp, or thinning strands who want fuller-looking hair without heavy silicones or harsh sulfates. It’s a solid pick for anyone with color-treated or chemically processed hair seeking everyday volume and a clean, fragranced wash. If you want to build a lightweight volumizing regimen, use alongside OUAI Fine Conditioner and OUAI Thickening Spray to maximize lift, strength, and manageability.

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