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OUAI thick hair shampoo bottle on a white background with a pink rose, lemon slices, orange slices, and jasmine flowers, with text reading 'MERCER STREET FRAGRANCE Notes of: ITALIAN LEMON, TURKISH ROSE, IRIS & WHITE MUSK'.
Before and after comparison of a woman with curly dark brown hair, showing the effect of a hair product. The top image is labeled 'BEFORE' and shows the hair as slightly frizzy; the bottom image is labeled 'AFTER' and shows the hair as smoother and more defined.
Before and after comparison of a woman's hair, showing a shoulder-length straight cut on the left and a shoulder-length wavy cut on the right, with the words BEFORE and AFTER at the top.
Best seller
OUAI thick hair shampoo bottle on a white background with a pink rose, lemon slices, orange slices, and jasmine flowers, with text reading 'MERCER STREET FRAGRANCE Notes of: ITALIAN LEMON, TURKISH ROSE, IRIS & WHITE MUSK'.
Before and after comparison of a woman with curly dark brown hair, showing the effect of a hair product. The top image is labeled 'BEFORE' and shows the hair as slightly frizzy; the bottom image is labeled 'AFTER' and shows the hair as smoother and more defined.
Before and after comparison of a woman's hair, showing a shoulder-length straight cut on the left and a shoulder-length wavy cut on the right, with the words BEFORE and AFTER at the top.

Thick Hair Shampoo - Jumbo

For thick hair, this color-safe Jumbo size shampoo cleanses & deeply moisturizes while strengthening & fighting frizz. It also leaves hair smelling amazing.

Size:
FULL SIZE (10 OZ) TRAVEL (3 OZ) JUMBO (16 OZ) REFILL (32 OZ)
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Get 60% more of the color-safe, deeply hydrating Thick Hair Shampoo you love with a jumbo size. 

With moisture-rich shea butter, softening marshmallow root, strengthening avocado oil & frizz-fighting hydrolyzed keratin,Thick Hair Shampoo fights frizz & hydrates while repairing & detangling for hair that feels nourished & healthy. 

It also smells amazing thanks to Mercer Street—a luxe fragrance with notes of Italian lemon, jasmine, & white musk. Plus, it now comes with an easy-to-use pump.

How to use

Thoroughly wet hair from roots to ends.
Add one pump to hands, then bring to a lather, next working into roots and anywhere hair touches the scalp.
Add an additional pump if hair isn't completely covered.
Rinse shampoo. Make sure to squeeze out excess moisture before pairing with Thick Conditioner.

ingredients

Aqua (Water, Eau), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl Cocoyl Taurate, Cocamide Mipa, Glycol Distearate, Parfum (Fragrance), Cetrimonium Chloride (Anti-Static Agent/Agent Antistatique), Panthenol, Hydrolyzed Keratin, Avena Sativa (Oat) Peptide, Butyrospermum Parkii (Shea) Butter, Althaea Officinalis Root Extract, Persea Gratissima (Avocado) Oil, Glycerin, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Peg-150 Distearate, Sodium Lauroyl Glycinate, Amodimethicone, C11-15 Pareth-7, Laureth-9, Trideceth-12, Polyquaternium-7, Cocoglucosides Hydroxypropyltrimonium Chloride, Acrylates Copolymer, Sodium Chloride, Sodium Hydroxide, Tetrasodium Edta, Disodium Edta, Citric Acid, Peg-200 Hydrogenated Glyceryl Palmate, Peg-7 Glyceryl Cocoate,1,2-Hexanediol, Caprylyl Glycol, Benzoic Acid, Potassium Sorbate, Phenoxyethanol, Sodium Benzoate, Benzyl Alcohol, Benzyl Salicylate, Limonene, Hexyl Cinnamal, Ci 14700 (Red 4), Ci 15985 (Yellow 6)

As always, all of our products are:
Paraben-Free, Cruelty-Free, Gluten-Free, Phthalate-Free, SLS and SLES-Free

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Thick Hair Shampoo - Jumbo

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THE SCENT:
MERCER STREET

TOP NOTES

Italian lemon, orange, peony, iris, lily

MIDDLE NOTES

Magnolia, jasmine, rose damask

BASE NOTES

Musk, orris

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Overall rating: 4.692748 / 5 from 524 reviews.

AI Generated Review Summary

This Thick Hair Shampoo Jumbo offers a deeply hydrating experience with its rich shea butter, marshmallow root, avocado oil, and hydrolyzed keratin. Customers praise its ability to fight frizz, detangle, and leave hair feeling clean, soft, and moisturized. The shampoo also boasts a luxurious Mercer Street fragrance and noticeable improvements in hair health and appearance.

Summary topics

  • Hair Feel: 18%
  • Hair Appearance: 5%
  • Fragrance Quality: 44%
  • Frizz Control: 5%

Review topics: ["size","fragrance","results","fit","quality","feels","ingredients","smells","texture","packaging","look","price","amount","bottle","hair","works","scalp","oil","residue","shipping","softness","line","use","difference","shampoo","conditioner","frizz","lather","buy","ouai"].

Review highlights

  • "My hair feels amazing." — Jessica J.
  • "my hair is so soft, it smells so good, and my hair finally looks healthy!!" — alix e.
  • "My hair feels so clean with a nice fresh rose scent." — Denise R.

Reviews

Best shampoo ever

"The best shampoo for thick wavy hair, that gently but effectively cleans my scalp and gets rid of any grit, and oil. Smells amazing too! This is the only shampoo that doesn’t dry out my scalp or make it oily. Perfect balance of everything. Keeps my hair so soft and shiny"

— Rachael S. (5/5)

"Has been a game changer for my hair"

— Christina (5/5)

"Im a frequent buyer"

— Regina (5/5)

Love this shampoo! It lathers

"Love this shampoo! It lathers so well and I like the smell!"

— Melanie F. (5/5)

It’s nice

"It’s nice smells good, lathered decent. I prefer the clean feeling of the detox shampoo better"

— Lana M. (4/5)

"Smells great"

— Claudette (5/5)

"Product came opened and box destroyed"

— Jeannette (2/5)

Works great. . . smells horrible

"After falling in love with the detox shampoo I decided to give this shampoo and conditioner a try. I've only used it a couple of times, but I can definitely see a difference in my hair when I use this versus other shampoos- my hair is much smoother and has some shine. But I seem to be the only person that thinks it smells absolutely terrible. I LOVE the smell of the detox shampoo, but this one. . . . it reminds me of the lingering smell of nail polish remover. I absolutely HATE it, and it lingers for days so I feel like I can't get away from it."

— Kristie (4/5)

NA

"Again, I appreciate the smaller travel size shampoo. It smells great & does a great job cleaning my hair."

— Cindy M. (4/5)

"🙂"

— Norma (5/5)

Q&A