The toxicity of partially hydrolyzed guar gum (PHGG, average molecular
weight 20,000) was evaluated in a 28-day, repeated oral dosing study
(gavage) in rats at doses of 0, 500, and 2,500 mg/kg/day and in Salmon
ella typhimurium, with and without metabolic activation. PHGG did not
elicit any signs of toxicity at the doses tested. PHGG was not mutagen
ic.