Prolactin Releasing Peptide (1-31), human is a high-affinity GPR10 ligand that causes prolactin release. It has Ki values of 1.03±0.41 nM (human GPR10) and 0.33±0.11 nM (rat GPR10). It stimulates plasma LH (10 min post ICV injection), FSH (20 min post ICV injection), and total plasma testosterone (60 min post ICV injection).