For adults: Polyquaternium-37 is generally safe to use on skin and hair in normal products like shampoos and conditioners. Overall health concerns are low.
Use products as directed. Rinse well if the product is a rinse-off (like shampoo). If you use a leave-on product and notice any itching, burning, or redness, stop using it. If you have very sensitive skin, try a small patch first or choose a product without this ingredient.
Some safety reviews recommend limits on how much can be used and whether it’s allowed in leave-on versus rinse-off products (Cosmetic Ingredient Review). A government report (Environment Canada) noted possible environmental harm and some signals of organ system effects in testing. These are why manufacturers may limit concentrations — they are not a strong signal of risk for normal adult use on intact skin, but you should avoid applying to broken skin and avoid letting concentrated product enter the environment (don’t pour large quantities down drains).
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This list shows products that contain Polyquaternium-37 or its alternative names.
Yes, Polyquaternium-37 is generally considered safe for adults based on current research.
May harm organs like liver, kidneys, or lungs with repeated use.
Possible negative effects on the environment
Polyquaternium-37 is commonly found in skincare products, cosmetics, and topical applications. Always check ingredient labels before use.
The appropriate age depends on the specific ingredient properties and concentration. This analysis is for adults. Use the age selector above to check other ages.
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