Polyquaternium-22 is generally a lower-concern ingredient for seborrheic dermatitis. It helps hair feel smoother, reduces static and can improve product slip, but it does not treat the condition.

A cosmetic safety assessment supports its covered uses and reports limited data without an irritation or sensitisation signal. As a large charged polymer, it is not a free fatty-acid source for Malassezia, and no direct human seb derm evidence was found. Fragrance and the cleansing system around it are more likely to determine scalp comfort.