Hormones.gr Can Ipamorelin Cause Erectile Dysfunction? Prolactin Releasing Peptide Contributes to Stress Related Mood Disorders and Inhibits Sleep Mood Regulatory Melanin Concentrating Hormone Neurons in Rats Journal of Neuroscience Prolactin a pleiotropic factor in health and disease Nature Reviews Endocrinology The most common GH releasing peptides: , Ipamorelin A ghrelin receptor agonist that triggers short pulses of growth hormone release from the pituitary with minimal effects on cortisol, prolactin, or