Lactoperoxidase is a naturally occurring enzyme that, as part of the lactoperoxidase system, generates antimicrobial compounds to inhibit bacterial growth. In skincare it is used for its antibacterial and mild preservative-supporting properties, and is sometimes included in oral care and sensitive-skin formulations.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation or mild redness | Rare | Generally well tolerated; transient irritation possible in sensitive individuals. |
Allergic contact sensitization | Very rare | As a protein-based enzyme, theoretical allergenic potential exists but reports are uncommon. |
Stinging on application | Rare | More likely on compromised or broken skin. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.