
Ipamorelin is a selective growth-hormone-secretagogue research peptide that acts as an agonist of the ghrelin receptor (GHS-R1a) on pituitary somatotrophs. It is studied for its ability to stimulate pulsatile growth-hormone release with high selectivity—shown in the foundational literature to spare cortisol, ACTH, and prolactin—making it a precise tool for researchers studying growth-hormone signaling and the mechanics of secretagogue selectivity.

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