The glutamic acid-alanine-glycine mixture is an orally active activator of testosterone 5α-reductase ( 5α-reductase ). It promotes prostate function by enhancing the activity of 5α-reductase and increasing the levels of free amino acids. However, when combined with testosterone and estradiol , the glutamic acid-alanine-glycine mixture inhibits 5α-reductase activity and decreases the levels of free amino acids. The glutamic acid-alanine-glycine mixture can be used in research related to prostate function and endocrine disorders.