The present invention concerns compositions and methods related to utilizing glycine and N-acetylcysteine for a variety of medical conditions related to reduced levels of glycine, N-acetylcysteine, and/or glutathione.本發明係關於涉及使用甘胺酸及N-乙醯半胱胺酸於與甘胺酸、N-乙醯半胱胺酸及/或穀胱甘肽含量減少相關之各種醫學病況的組合物及方法。