What does Quaternium-91 do in hair products?

Quaternium-91 is a conditioning agent that helps to soften hair, reduce frizz, and make it easier to comb, commonly found in conditioners and hair masks.

Is Quaternium-91 safe for sensitive scalps?

While generally considered safe, some individuals with very sensitive scalps might experience mild irritation from Quaternium-91, as with many conditioning agents.

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Quaternium-91

Quaternium-91 is a synthetic quaternary ammonium compound used in hair care products. It acts as a conditioning agent, helping to soften hair, reduce frizz, and improve combability. It works by forming a protective film on the hair surface, which can also contribute to shine.

NoneHair conditioning agentVeganEvidence: Medium

BenefitModerate 1.8 / 4

RiskLow 1 / 4

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

Conditions and softens hair
Reduces frizz
Improves wet and dry combability
Enhances hair shine

Things to watch

May cause scalp irritation in sensitive individuals
Potential for buildup on hair over time

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Products with Quaternium-91

Schwarzkopf

Gliss Night Elixir

3.7/ 59/7/15

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Frequently asked questions

What does Quaternium-91 do in hair products?: Quaternium-91 is a conditioning agent that helps to soften hair, reduce frizz, and make it easier to comb, commonly found in conditioners and hair masks.
Is Quaternium-91 safe for sensitive scalps?: While generally considered safe, some individuals with very sensitive scalps might experience mild irritation from Quaternium-91, as with many conditioning agents.