Is Thick Hair Shampoo by OUAI safe?

Thick Hair Shampoo is rated STOP by Million Marker due to ingredients with known health concerns. We recommend considering safer alternatives.

What harmful chemicals does Thick Hair Shampoo avoid?

Million Marker evaluates products for harmful chemicals including BPA, phthalates, parabens, PFAS, flame retardants, and other endocrine-disrupting compounds. Thick Hair Shampoo has been analyzed and rated STOP based on its ingredient profile.

Where can I buy Thick Hair Shampoo?

You can purchase Thick Hair Shampoo directly from OUAI or search online retailers for the best prices and availability.

How does Million Marker rate Shampoos + Conditioners?

Million Marker rates Shampoos + Conditioners and other products on a GO/SLOW/STOP scale based on ingredient safety analysis. GO products are the safest choices, SLOW products have moderate concerns, and STOP products contain ingredients we recommend avoiding.

Products are split into three levels based on ingredient labels

Best choice

SLOW

Contains ingredients with possible health concerns

STOP

Contains harmful ingredients

STOP

OUAI

Thick Hair Shampoo

Last verified: April 7, 2026

Water (Aqua, Eau)
Sodium C14-16 Olefin Sulfonate
Cocamidopropyl Betaine
Sodium Methyl Cocoyl Taurate
Cocamide MIPA
Glycol Distearate
Parfum (Fragrance)
Cetrimonium Chloride
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
Red 4 (CI 14700)
Yellow 6 (CI 15985)

Why This Product is Rated STOP

Thick Hair Shampoo by OUAI has been evaluated by Million Marker and contains ingredients with known health concerns. This product is rated STOP, indicating higher concern.

We recommend avoiding STOP-rated products and seeking safer alternatives from our GO or SLOW categories.

Learn more about how Million Marker scores products →