Hydroxyethylpiperazine Ethane Sulfonic Acid (HEPES) is a synthetic zwitterionic buffering agent used in skincare to stabilize formulation pH and to help promote gentle desquamation by supporting enzymatic shedding of corneocytes. It is often paired with exfoliating acids and other actives to enhance skin renewal while maintaining a stable, skin-compatible pH.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient stinging or tingling | Uncommon | More likely on sensitive or compromised skin, particularly in combination with exfoliating acids. |
Skin irritation or redness | Rare | Generally well tolerated; irritation more associated with co-formulated actives than HEPES itself. |
Contact dermatitis or allergic reaction | Very rare | Sensitization reports are minimal in available literature. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.