Trehalose is a naturally occurring disaccharide used in skincare as a humectant and protective agent, helping retain moisture and stabilize cell membranes and proteins against dehydration and oxidative stress. It is well tolerated and commonly used to support skin barrier hydration.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient irritation or stinging | Rare | Generally reported only at high concentrations or on compromised skin barriers. |
| Allergic contact dermatitis | Very rare | Isolated case reports; trehalose has low sensitizing potential. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.