Hydrolyzed Sodium Hyaluronate

Hydrolyzed sodium hyaluronate is a low–molecular weight form of hyaluronic acid used primarily as a humectant/skin-conditioning agent, typically at low concentrations (often well under 1%). Clinical experience and patch testing data for hyaluronate salts show very low irritation and sensitization rates, but the hydrolyzed/low-MW forms can sting more than higher-MW HA when the barrier is compromised (e.g., eczema, post-procedure) or when layered with other actives. Given this small but real reactivity risk in highly sensitive populations, it is best categorized as very gentle rather than exceptionally gentle. Safety Notes: In commercial skincare, hydrolyzed sodium hyaluronate (low-molecular-weight HA salt) is often used at very low levels (around 0.0001–0.01%) in mass-market lotions/cleansers and multi-ingredient serums where it functions as a label/skin-feel humectant rather than a primary active. Most leave-on serums and gels sit roughly in the 0.05–0.5% range, while high-strength consumer “hyaluronic acid booster” products and anhydrous-to-aqueous concentrates can reach about 1–2% before viscosity/film-feel, tack, and stability constraints become limiting; rinse-off products typically use the low end because deposition is limited.