Glycine acts as a calming neurotransmitter in the nervous system and helps control ammonia levels in the brain. It also contributes to the maintenance of motor functions, among other properties. Dietary supplements are food products whose purpose is to supplement the normal diet, consisting of concentrated sources of nutrients or other substances that have a nutritional or physiological effect, in simple or combined form, and are marketed in such a way as to allow a specific dosage of each product and to be taken in small unit quantities.