Sodium lactate is the sodium salt of lactic acid and a key component of skin's natural moisturizing factor (NMF), used to hydrate the skin and buffer formulation pH. It also has mild exfoliating and humectant properties that help maintain skin moisture and barrier function.
| Reported effect | How often | Notes |
|---|---|---|
Increased photosensitivity | Common | As an alpha-hydroxy acid derivative it can heighten sensitivity to UV; sunscreen use is advised. |
Skin irritation, stinging or burning | Uncommon | More likely at higher concentrations or on compromised/sensitive skin. |
Redness or dryness | Uncommon | Paradoxical irritation possible in some individuals despite its humectant role. |
Allergic contact dermatitis | Rare | Sensitization is infrequently reported. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.