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Choose Ipamorelin When: The study needs GH elevation without HPA axis activation cortisol and prolactin need to remain as clean controls Long-duration protocols require sustained receptor sensitivity (Ipamorelin shows better maintenance of GH responsiveness over extended preclinical timelines) Investigating GH-specific effects on bone mineral density, lean tissue accretion, or sleep in clean model systems Working with aged animal models where baseline HPA reactivity is already elevated and adding corticotrophic stimulation would confound every readout Running GHRH combination protocols Ipamorelin paired with CJC-1295 has become one of the most-studied combination protocols for clean, sustained IGF-1 elevation in animal models Choose GHRP-2 When: Maximum GH pulse amplitude is the primary endpoint nothing in this class delivers higher peak somatotroph stimulation The research design actively benefits from HPA co-activation as an additional readout, or controls for it directly Metabolic endpoints dominate adipose lipolysis, body composition shifts, insulin sensitivity in diet-induced obesity models GHSR-1a pharmacology characterization in receptor-mutant or knockout models demands potent full-agonist saturation Studying cardiac or cytoprotective mechanisms that may run through GHSR-1a-mediated PI3K/Akt survival signaling Choose GHRP-6 When: The research question extends beyond the pituitary into ghrelin axis biology orexigenic signaling, NPY/AgRP pathways, hypothalamic feeding circuits Gastric motility or gut-brain axis work is part of the study design Replicating or building directly on the decades of foundational GHRP literature GHRP-6 is the original reference compound and methodology comparison often demands the same tool Energy homeostasis models where ghrelins complete biological program needs to be active simultaneously CNS function studies probing GHSR-1a heterodimer activity with dopamine receptors GHRP-6s structural proximity to ghrelin makes it the right probe for that work Pulsatile GH Release Dynamics: A Deeper Look How GHRPs shape pulsatile GH secretion is worth understanding beyond the headline mechanism particularly because it determines whether experimental results are physiologically interpretable or not

& Long, D

Morales-Juarez L

Cox 1994