Influence of drinking water with different contents of potassium stearate in combination with manganese on lipid peroxidation and antioxidant protection in the body of rats. Found that pro-longed use of experimental animals aqueous solution of potassium stearate concentrations of 125.0 and 62.5 mg/dm3 negative impact on the cell membrane of hepatocytes from the activation of lipid peroxidation and inhibition of antioxidant system. The combination of potassium stearate with cad-mium even after a single injection last enhances the toxic effect of potassium stearate.