What does sodium lactate do for the skin?

It acts as a humectant and natural moisturizing factor component, drawing water into the skin's surface to support hydration and barrier function.

Is sodium lactate the same as lactic acid?

Sodium lactate is the salt form of lactic acid; unlike lactic acid, it does not have significant exfoliating activity and functions mainly as a humectant and pH adjuster.

Is sodium lactate safe for sensitive skin?

Yes, it is generally considered gentle and well tolerated, including for sensitive and reactive skin types.

Can sodium lactate be used during pregnancy?

Yes, it is considered safe for use during pregnancy given its role as a naturally occurring skin hydration component.

Does sodium lactate help with dry skin?

Yes, as a natural moisturizing factor component, it helps replenish hydration in dry or dehydrated skin when used in moisturizers and serums.

Sodium Lactate — Ingredient Guide

How it works

Sodium lactate is the sodium salt of lactic acid and a naturally occurring component of the skin's natural moisturizing factor (NMF), the collection of hygroscopic, water-attracting molecules that help the stratum corneum retain moisture and maintain flexibility. As a humectant, it draws water from the environment and deeper skin layers into the surface, supporting hydration and overall skin barrier function. It is also commonly used to adjust and buffer the pH of cosmetic formulas, helping keep other pH-dependent actives, such as certain acids and vitamin C derivatives, stable and effective over the product's shelf life.

The evidence

Sodium lactate's role as a component of the skin's natural moisturizing factor is well established in dermatological and cosmetic science literature, with foundational research on NMF components supporting their contribution to stratum corneum hydration, elasticity, and barrier function, particularly in skin affected by dryness or environmental stress. Its widespread inclusion in moisturizers across the cosmetic industry reflects both its demonstrated humectant efficacy and its practical dual function as a reliable pH adjuster in diverse formula types.

Suitability

Suitable for all skin types, including sensitive and oily skin, due to its lightweight, non-comedogenic humectant profile.
Particularly beneficial for dry or dehydrated skin needing natural moisturizing factor replenishment.
Well tolerated with minimal irritation risk at typical cosmetic concentrations, unlike its parent acid, lactic acid.

Concentration

Commonly used at 1–10% in moisturizers, essences, and hydrating serums.
Often present in smaller amounts purely for pH-adjusting purposes rather than as a headline hydrating ingredient on the label.
Frequently featured in formulas aimed at replicating the skin's own moisture-retention chemistry.

Conflicts & combinations

No significant known conflicts with common actives.
Pairs well with other humectants like glycerin and hyaluronic acid, and with NMF-supporting ingredients like urea, for layered, comprehensive hydration.
Suitable for use alongside exfoliating acids and retinoids as part of a broader hydration strategy to offset associated dryness.