Glutathione is a tripeptide antioxidant used in skincare for its melanin-modulating and antioxidant properties, often promoted to reduce hyperpigmentation and even skin tone. Topical efficacy data is limited and variable, with stronger systemic effects associated with oral or intravenous routes.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or redness | Uncommon | May occur with topical application, particularly in sensitive skin. |
Contact allergic reaction | Rare | Sensitization to the ingredient or formulation components is possible. |
Skin lightening beyond intended areas / uneven results | Rare | Reported mainly with systemic use rather than topical. |
Serious adverse events such as skin rashes, organ effects, or Stevens-Johnson syndrome | Very rare | Primarily linked to intravenous/injectable use, which lacks regulatory approval for skin lightening in many regions. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.