Polyglucuronic Acid

Polyglucuronic acid is a high–molecular weight polysaccharide/uronic-acid polymer used primarily as a humectant/film former at low concentrations (typically well under a few percent), where it functions similarly to other skin-conditioning biopolymers. Available safety/patch-test information on poly-uronic acid polymers shows low irritation potential, with reactions more likely related to impurities or formulation pH rather than the polymer itself. For severely reactive or barrier-impaired patients I still assign a small non-zero risk because any polymeric film former can occasionally sting on compromised skin, but it is generally very gentle in routine use. Safety Notes: Polyglucuronic Acid (a glucuronic-acid–rich polysaccharide/biopolymer used for humectancy and film-forming) is typically dosed at very low levels in mass-market leave-on products (toners/serums/creams) around 0.01–0.1% as a secondary moisturizing/texture aid. Higher-strength consumer serums and gel-creams that position it as a primary hydration/skin-feel polymer commonly reach ~0.5–1.0%, with the upper end around ~2.0% in some OTC leave-on “booster”/ampoule-style formulas before viscosity/feel and stability constraints become limiting; rinse-off products tend to sit toward the lower end because of short contact time.