Ipamorelin and GHRP-2: Research Insights into GH Secretagogue Combinations

Ipamorelin and GHRP-2: Research Insights

Both Ipamorelin and GHRP-2 are synthetic growth hormone releasing peptides (GHRPs) that act as ghrelin receptor agonists. While they share a mechanism of action, they differ in selectivity and secondary effects studied in research settings.

Ipamorelin: High Selectivity

Ipamorelin is notable for its high selectivity for growth hormone release with minimal effect on cortisol, prolactin, or ACTH secretion. This clean profile makes it valuable for research isolating GH-specific signalling pathways.

GHRP-2: Potency and Appetite

GHRP-2 is generally considered more potent than Ipamorelin in terms of GH pulse amplitude, but also causes greater stimulation of cortisol and prolactin. It also has well-documented appetite-stimulating effects through central ghrelin receptor activation.

Research Considerations

The choice between these compounds depends on the research question. Studies requiring isolated GH pathway activation benefit from Ipamorelin's selectivity, while studies examining ghrelin receptor physiology more broadly may prefer GHRP-2.