Oxothiazolidine (Otz-10), or L-2-oxothiazolidine-4-carboxylic acid, is a cysteine prodrug that intracellularly converts to cysteine and boosts glutathione synthesis. In skincare it is used as an antioxidant and for potential brightening and protective effects against oxidative stress.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or stinging | Uncommon | Transient localized reaction reported with topical use. |
Redness/erythema | Uncommon | Usually mild and resolves after discontinuation. |
Contact dermatitis or allergic sensitization | Rare | Possible in individuals sensitive to the ingredient or formulation excipients. |
Itching (pruritus) | Rare | Reported infrequently with topical application. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.