Polyquaternium-37 is a synthetic cationic polymer used in skincare and haircare to thicken formulations, stabilize emulsions, and form a smoothing film on skin and hair. It is a formulation aid rather than a therapeutic active.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation | Rare | Occasional transient redness or stinging, typically formulation-dependent. |
| Allergic contact dermatitis | Very rare | Isolated sensitization reports; the polymer is generally considered low-risk. |
| Eye irritation | Uncommon | Possible upon direct contact in rinse-off or hair products. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.