Methoxycinnamidopropyl Hydroxysultaine is an amphoteric (zwitterionic) surfactant derived from cinnamic acid, used in cleansing and conditioning formulations as a mild detergent, foam booster, and antistatic agent. It is considered a functional formulation ingredient rather than a treatment active.
| Reported effect | How often | Notes |
|---|---|---|
Skin or scalp irritation | Uncommon | Mild irritation possible, particularly in leave-on or high-concentration products; amphoteric surfactants are generally lower-irritation than anionic types. |
Eye irritation | Uncommon | Can cause transient stinging or irritation on direct ocular contact in rinse-off cleansers. |
Allergic contact dermatitis | Rare | Sensitization reported infrequently; cinnamate-derived structures may theoretically be relevant in cinnamic-allergic individuals. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.