Is Amino Acid Shampoo by Kiehl's safe?

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

What harmful chemicals does Amino Acid Shampoo avoid?

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

Where can I buy Amino Acid Shampoo?

You can purchase Amino Acid Shampoo directly from Kiehl's 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

Kiehl's

Amino Acid Shampoo

Last verified: March 10, 2026

Shampoo

Aqua / Water
Sodium Methyl Cocoyl Taurate
Sodium Coco-Sulfate
Sodium Chloride
Coco-Betaine
Lactic Acid
Parfum / Fragrance
Ppg-5-Ceteth-20
Sodium Lauroyl Glutamate
Propylene Glycol
PEG-55 Propylene Glycol Oleate
Salicylic Acid
Benzoic Acid
Guar Hydroxypropyltrimonium Chloride
Coconut Alcohol
Sodium Sulfate
Cocos Nucifera Oil / Coconut Oil
Coumarin
Wheat Amino Acids
Fumaric Acid
Hydroxypropyltrimonium Hydrolyzed Wheat Protein
Phenoxyethanol
Disodium Edta
Potassium Sorbate

Why This Product is Rated STOP

Amino Acid Shampoo by Kiehl's 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 →

Frequently Asked Questions

Amino Acid Shampoo by Kiehl's - Non-toxic Shampoos + Conditioners product rated STOP by Million Marker, free from BPA, phthalates, and parabens

Where to buy

Kiehl's Google Search

Please note that product images displayed on this page are obtained from third-party sources and provided for informational purposes only. Manufacturers and retailers may change product packaging, labeling, ingredients, or appearance without notice, so images may not reflect the most current version. Million Marker does not guarantee the accuracy of product images.