Is Normal Human Urine Toxic?

Tolerance tests for urine on a surviving organ (frog heart), and on different species of laboratory animals as well as clinical findings in man prove that human urine is not toxic. The delayed fatal effects which follow the injection of certain urine specimens (7%) into animals are due to infections. Ether treatment renders such urine specimens innocuous not because it removes a toxic substance from the urine but because it is bacteriostatic or bactericidal.