OUAI Medium Hair Shampoo — 32 oz Hydrating, Sulfate-Free Formula for Medium Texture, Strengthens & Reduces Breakage

OUAI Medium Hair Shampoo is a salon-size, hydrating sulfate-free cleanser designed specifically to nourish, strengthen and reduce breakage for medium-textured hair while restoring shine.

Made to suit hair that’s neither fine nor coarse, this 32-ounce formulation combines babassu and coconut oils with keratin and kumquat extract to hydrate strands, smooth frizz and improve manageability. The clean formulation is free of sulfates, parabens and phthalates, safe for color- and chemically-treated hair, and carries OUAI’s signature Mercer Street scent of Italian lemon, jasmine and white musk. Use it as the first step in a routine with OUAI Medium Conditioner and OUAI Hair Oil for best results.

How does this shampoo address frizz and breakage?

The formula targets frizz and breakage by layering hydrating plant oils with keratin protein to temporarily strengthen and smooth each strand. Oils help seal and condition the hair surface while keratin improves slip so hair detangles with less mechanical stress during washing.

• Babassu oil hydrates the scalp and hair shaft for flexible, less brittle strands.
• Coconut oil helps seal ends and reduce moisture loss that causes breakage.
• Keratin smooths hair cuticles, decreasing friction and frizz during styling.
• Kumquat extract restores luminous shine without heavy residue.

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

Yes — the sulfate- and paraben-free formula is gentle enough for color- and keratin-treated hair while still delivering a thorough cleanse. Because it avoids harsh sulfates, it reduces color stripping and helps maintain treatment integrity when used as directed.

• Sulfate-free cleansing preserves hair color vibrancy.
• Safe for keratin- and chemically-processed strands.
• Hydrating oils counteract drying effects of chemical services.
• Pair with color-safe OUAI conditioner for longer-lasting results.

How should I use OUAI Medium Shampoo for best results?

Apply the shampoo to wet hair, focus on the roots and gently work through to the ends to cleanse without over-stripping. Rinse and follow with OUAI Medium Conditioner to lock in moisture, then add a small amount of OUAI Hair Oil for controlled shine and reduced flyaways.

• Wet hair thoroughly, apply shampoo to scalp and roots.
• Work product down to ends to distribute without tugging.
• Rinse fully and follow with Medium Conditioner for hydration.
• Finish with a light layer of Hair Oil for smoothing and shine.

What makes the ingredients list "clean" and what should I expect from the scent?

OUAI emphasizes formulations free of sulfates, parabens and phthalates, and the shampoo is cruelty-free and gluten-free — offering a modern, lower-irritant option for everyday use. The Mercer Street fragrance brings a bright, balanced aroma of Italian lemon, jasmine and white musk that reads fresh in the shower and lingers subtly on hair.

• Free from sulfates, parabens and phthalates for gentler cleansing.
• Cruelty-free and gluten-free formulation.
• Light, travel-friendly Mercer Street scent with citrus and musk notes.
• Clean ingredients chosen to balance performance and gentleness.

Who this is for: OUAI Medium Hair Shampoo is intended for people with medium-density hair — not overly fine and not thick — who want a salon-sized, everyday shampoo that reduces frizz and breakage while maintaining color and chemical treatments. Ideal for straight, wavy, curly or coily textures that need hydration and improved manageability, and for anyone looking to build a simple, effective OUAI routine with matching conditioner and styling oil.