Human Urine (IMAGE) U.S. Army Research Laboratory Caption Human urine is about 96 percent water and four percent waste products, but there are more than 3,000 compounds are found in the fluid. Army scientists are experimenting with producing hydrogen from urine. Credit Photo Credit: David McNally, ARL Public Affairs Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.