Humectant

Sodium Lactate

Sodium lactate is a powerful NMF moisturizer and pH regulator. Less known than glycerin, but more effective in moisture retention at the same concentrations.

NMFHydrationpH regulatorLactate

✓ Safe

Comedogenic Rating

0/5

Irritation Potential

0/5

What is it?

Sodium Lactate (INCI: Sodium Lactate) — sodium salt of L-lactic acid. Naturally present in the Natural Moisturizing Factor (NMF) of the stratum corneum — ~12% of the total NMF. NMF is a mixture of hygroscopic molecules in the stratum corneum that maintains hydration and pH. Sodium lactate buffers pH at levels of 5–6. Produced by fermentation or neutralization of lactic acid. A 60% aqueous solution is the standard form in cosmetics.

Moisturizing component in toners, lotions, and creams. pH buffer in formulas. Combines with glycerin, sodium PCA, and amino acids for a complete NMF mimic.

Key Benefits

✦

Powerful hydration through NMF action — more effective than glycerin

Sodium lactate retains water more effectively than glycerin at the same concentrations — more pronounced H-bonding ability. Slowly releases water into the stratum corneum. At 2% concentration in toner — measurable increase in stratum corneum moisture within 6–8 hours after application.

◈

pH regulation and support of the acid mantle

Lactate/lactic acid — the main buffering system of the skin (pH 4.5–5.5). Sodium lactate restores pH after alkaline cleansing and stress. Optimal pH is critical for the functioning of exfoliating enzymes, protective microflora, and antimicrobial peptides.

✧

Support for ceramide synthesis through physiological pH

Ceramide synthesis enzymes (β-glucocerebrosidase, sphingomyelinase) are active at pH 5–5.5. Sodium lactate supports this pH — indirect stimulation of barrier lipid synthesis. Synergistic effect with ceramides and phytosterols in complex restorative formulas.

Suitable for

Suitable for all skin typesFor dry skinFor dehydrated skin

Main Actions

✓ Hydration through NMF✓ pH regulation✓ Support for the acid mantle

Sodium Lactate vs Lactic Acid

Lactic acid — AHA-exfoliant and moisturizer, acidic pH (~3.5). Sodium lactate — its salt, neutral pH, without exfoliating properties. Both moisturize and are part of NMF. In toners and light essences for hydration (not exfoliation) — sodium lactate is a milder choice with no risk of irritation.

CategoryHumectants

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