TAK-683 acetate is a potent full KISS1 receptor (KISS1R) agonist (IC50=170 pM) with improved metabolic stability. TAK-683 acetate is a nonapeptide metastin analog, exhibits agonistic activities to KISS1R with EC50 values of 0.96 nM and 1.6 nM for human and rat, respectively. TAK-683 acetate depletes GnRH in the hypothalamus and reduces plasma FSH, LH, and testosterone levels in vivo, it has the potential for the study of hormone-dependent prostate cancer.