Sodium Glycolate

Sodium glycolate is the neutralized salt of glycolic acid used as an exfoliating/humectant ingredient; in leave-on products it can still contribute to increased glycolate availability and a functional pH that promotes sting, especially at typical AHA-relevant levels (~2–10%). Clinically, glycolic systems are associated with burning/erythema in sensitive or eczematous skin even when partially neutralized, and cumulative irritation risk rises when layered with retinoids, benzoyl peroxide, or other acids. For compromised skin, I treat sodium glycolate as an active requiring careful introduction and patch testing rather than a “gentle” salt. Safety Notes: In commercial skincare, sodium glycolate is most often used as the neutralized salt form of glycolic acid (AHA) within exfoliating systems or as part of pH-adjustment/buffering, so it can appear at very low levels (~0.05–0.3%) in gentle cleansers/toners where the exfoliation claim is minimal and the salt primarily supports pH control. The upper end is observed in high-strength consumer AHA leave-on products where a portion of the total glycolic system is present as sodium glycolate (partially or fully neutralized), reaching up to ~10% sodium glycolate in strongly buffered/neutralized exfoliating gels/lotions (distinct from professional peels). Rinse-off products typically sit lower due to short contact time and irritation management, while leave-on exfoliants drive the highest market levels; there is no specific EU/FDA concentration cap for sodium glycolate itself, but practical use is constrained by pH, irritation potential, and overall AHA system strength.