Hexarelin Acetate vs Sermorelin Acetate

Hexarelin Acetate

Hexarelin is a synthetic six-amino-acid peptide that acts as a potent growth hormone secretagogue, stimulating GH release through the ghrelin/GHS-R1a receptor. Beyond its pituitary effects, research has explored hexarelin's interaction with the CD36 receptor in cardiovascular tissue, where it has been studied for potential cytoprotective and anti-fibrotic signaling in cardiac models. It is investigated in growth hormone axis research and comparative GHS studies alongside GHRP-6 and ipamorelin. Supplied as a lyophilized powder for in-vitro and laboratory research use only.

Sermorelin Acetate

Sermorelin acetate is a synthetic 29-amino acid peptide corresponding to the first 29 residues of the 44-amino acid human growth hormone-releasing hormone (GHRH 1-29). It represents the shortest fully functional fragment of GHRH capable of activating the GHRH receptor on anterior pituitary somatotrophs. Sermorelin was FDA-approved (marketed as Geref) for diagnostic evaluation of pituitary GH secretory capacity and was previously used in pediatric growth hormone deficiency research. Its mechanism involves GHRH-R binding, which activates adenylyl cyclase-cAMP-PKA signaling to stimulate GH gene transcription, synthesis, and pulsatile release. Clinical studies by Vittone et al. (Journal of Clinical Endocrinology and Metabolism, 1997) demonstrated that sermorelin use in elderly subjects increased GH secretion and improved body composition markers including lean body mass and skin thickness. Importantly, because sermorelin works through the native GHRH receptor, GH release remains subject to somatostatin-mediated negative feedback, preserving physiological regulation unlike direct GH use. Research has also explored sermorelin in cardiovascular contexts, where GH-IGF-1 axis activation may support cardiac tissue remodeling, and in seizure models where GHRH receptor activation appears to have neuroprotective effects. Compared to CJC-1295 (with or without DAC), sermorelin has a shorter half-life of approximately 10-20 minutes, requiring more frequent use but producing very precise, physiological GH pulses. Store lyophilized powder at -20C; reconstitute with bacteriostatic water and refrigerate at 2-8C for up to 14 days. Sermorelin is studied by pediatric endocrinology research centers, geriatric medicine departments, and cardiovascular research institutions investigating GH axis modulation.

Frequently Asked Questions