It all depends on how much you drink. Glycine is an amino acid that acts as a mediator in the body, that is, it transmits electrochemical impulses in the nervous system. In other organs and tissues, it serves as a building block for several proteins, including collagen. Glycine is not a drug, but a dietary supplement, so it is sold without a prescription. People prescribe it to themselves for sleep problems, anxiety, heart disease, for rehabilitation after a heart attack. In terms of effectiv...