Dr. Clark recommends ornithine in the course of the cleansing, because it degrades ammonia in the liver, which, according to Dr. Clark, is released when microorganisms are killed. Ornithine is an amino acid manufactured by the body. It is produced when another amino acid, arginine, is metabolized during the production of urea, a substance found in human urine. L-ornithine is a key compound in the urea cycle, one of the body's main processes for eliminating ammonia.* Supplementing with ornithine helps in a good night's sleep. It can be taken continuously without harmful effects or potential of addiction. It also helps to reduce physical fatigue.*