Mannitol is a sugar alcohol (polyol) used in skincare primarily as a humectant and texture-enhancing agent, and it also functions as a free-radical scavenger. It is generally considered a base/formulation ingredient rather than a therapeutic active.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation or mild stinging | Rare | Uncommon and typically mild when applied topically; more often reported with high concentrations. |
| Allergic contact dermatitis | Very rare | Isolated case-type reports; sensitization to mannitol is unusual. |
| Transient redness | Rare | Generally resolves quickly without intervention. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.