Urine is a slightly acidic fluid which carries waste from the kidneys to the outside world. The kidneys have millions of nephrons which filter toxins, waste, ingested water and mineral salts out of the bloodstream. The kidneys regulate blood acidity by excreting excessive alkaline salts when necessary. The chief constituent of the nitrogenous wastes in urine is urea, a product of protein decomposition. Urea is, among other things, a diuretic. Average adult urine production is from one to two quarts a day. The bladder, where urine is stored for discharge, holds on average about 16-20 ounces of fluid, though the average discharge is about half that amount. In addition to uric acid, ammonia, and creatine, urine consists of many other waste products in minute quantities.
Being a waste product does not mean that a substance is toxic or harmful. It means that the body cannot absorb the substance at the present time. We might think of many of urine's constituents as if they were leftovers from a meal. We could throw the excess food away or we could eat it later after diluting it substantially with water and putting it in the blender. With urine, unfortunately, we cannot ingest waste products in the form they had when first ingested.
