Arginine and Ornithine from NOW Foods:

Popular Aminos Support Urea Metabolism and Recovery!

Arginine and Ornithine combines two essential amino acids into one optimal supplement. Arginine is necessary for urea metabolism, a process that prepares toxic ammonia for safe excretion by the kidneys. The amino acid, arginine, has several roles in the body, such as assisting in wound healing, helping remove excess ammonia from the body, stimulating immune function, and promoting secretion of several hormones, including glucagon, insulin, and growth hormone.
The effect of arginine on growth hormone levels1 has interested body builders. In a controlled trial, when arginine and ornithine (500 mg of each, twice per day, five times per week) were combined with weight training, a greater decrease in body fat was obtained after only five weeks, than when the same exercise was combined with a placebo. Ornithine, an amino acid, is manufactured by the body when arginine, is metabolized during the production of urea (a constituent of urine).