The essential trace mineral copper forms a vital component of several enzyme systems in the human body. These enzymes are active in biochemical processes such as cellular energy generation, the formation of links in collagen molecules, and in the formation and synthesis of melanin - skin pigment, and elastin - a skin protein. Copper is also used as an important structural element in the formation of the myelin sheath, which covers the nerve fibers and aids in the rapid transmission of nerve impulses. Many important oxidation reduction reactions in the body are catalyzed by copper; these include the formation of water from the free hydrogen and oxygen present in the cells. The catalytic action of copper reduces the impact of this reaction; this biochemical reaction could be very explosive if the copper were not present. The sense of taste generated in the human tongue is also influenced by the presence of copper. Copper must also be available in sufficient quantities in the body to allow for the full utilization of iron, the absorption of the mineral iron into the body is also stimulated by copper. In homeopathy, nervous system problems and respiratory complaints are among the conditions treated with this homeopathic remedy, which was proved in 1834. Cuprum met. mainly affects the nervous system and is used to treat cramps that start with twitching and jerking in the toes and then spread deep into the feet, ankles, and calves. This remedy is effective in the treatment of epilepsy, with muscular spasms and convulsions that start in the fingers and toes and spread to the center of the body. It is also an important remedy for exhaustion caused by mental exertion. Cuprum met. is good for respiratory problems, such as asthma and whooping cough, in which there may be short periods when breathing seems to stop. The person looks pale and they may turn blue; when drinking they may make a gurgling noise.