Carrageenan is a sulfated polysaccharide extracted from red algae used in skincare as a thickening, gelling, and emulsion-stabilizing agent that also provides mild film-forming and humectant properties. It is a formulation/texture ingredient rather than a therapeutic active.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation | Rare | Generally well tolerated topically; mild irritation reported infrequently in sensitive individuals. |
| Allergic contact dermatitis | Very rare | Isolated case reports of sensitization to carrageenan in topical or formulation contexts. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.