Potassium lactate is the potassium salt of lactic acid used in skincare primarily as a humectant and moisturizing agent that helps maintain skin hydration and as a buffering agent to adjust formulation pH. It is a component of the skin's natural moisturizing factor (NMF).
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or stinging | Uncommon | Transient sensation, more likely on compromised or sensitive skin |
| Increased photosensitivity | Uncommon | As a lactic acid derivative it may enhance UV sensitivity; sunscreen use advised |
| Contact dermatitis or allergic reaction | Rare | Localized redness or itching in sensitive individuals |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.