"Old School Gains" Classic Secretagogue

The Classic Secretagogue kit pairs Sermorelin 5mg with GHRP-2 5mg, the original GHRH-plus-ghrelin secretagogue pairing before CJC-1295 and Ipamorelin became the more commonly referenced combination. Both compounds still turn up regularly in comparative growth hormone secretagogue research and remain relevant for duration-of-action and selectivity studies.

Before longer-acting analogs like CJC-1295 and Ipamorelin became standard in growth hormone secretagogue research, Sermorelin and GHRP-2 were the reference pairing, and they remain relevant for comparative pharmacology work precisely because of their shorter, more native-like activity profiles. This kit bundles both for researchers running comparison protocols against newer-generation secretagogues, or who specifically want the shorter-acting research profile.

What's Included in This Kit

• Vial 1, Sermorelin (5mg): GHRH(1-29) fragment studied for growth hormone-releasing hormone receptor activation.
• Vial 2, GHRP-2 (5mg): ghrelin receptor agonism and growth hormone secretagogue research.

Sermorelin: The Native GHRH Fragment

Sermorelin is a fragment of growth hormone-releasing hormone corresponding to the first 29 amino acids, GHRH(1-29). It is studied for the same GHRH receptor activation pathway as CJC-1295, but without the modifications that extend CJC-1295's duration of action, making it useful in research where a shorter, more native GHRH signal is the point of comparison.

GHRP-2: A Broader-Spectrum Ghrelin Agonist

GHRP-2 is a synthetic growth hormone-releasing peptide studied for ghrelin receptor agonism. Compared to Ipamorelin, GHRP-2 is referenced in the literature as having a broader receptor interaction profile, which is exactly why researchers studying selectivity differences often want both compounds available side by side. That broader profile also means GHRP-2 research sometimes needs to account for cortisol and prolactin cross-reactivity as a confounding variable, something Ipamorelin's narrower selectivity was specifically developed to reduce.

When Researchers Choose the Classic Pairing

Newer secretagogue analogs were generally developed to extend duration of action or narrow receptor selectivity relative to their predecessors, but that does not make the earlier compounds obsolete for research purposes. Sermorelin's shorter half-life is exactly what some protocols require when the research question concerns a single, well-defined GHRH pulse rather than sustained receptor engagement. Similarly, GHRP-2's broader receptor interaction profile, relative to Ipamorelin, is itself a research variable in studies examining how receptor selectivity affects downstream GH-axis outcomes. Researchers running head-to-head comparisons across secretagogue generations, or specifically replicating older study designs, are the primary audience for this kit rather than researchers simply looking for the newest available compounds.

Related Research Bundles

For the newer-generation version of this same pairing, see GH Secretagogue (CJC-1295 and Ipamorelin), or Extended GH / IGF for the DAC-modified, extended-duration variant. Browse the full Peptide Bundles collection for the complete lineup of multi-peptide research kits.

Both vials ship individually labeled with compound name, strength, and batch lot number and are not co-formulated. Each is independently HPLC-verified for identity and purity before batch release. As with every research kit on the site, Sermorelin and GHRP-2 are manufactured and tested to the exact same standard whether purchased individually or as part of this bundle, the only difference is the combined price and single shipment rather than two separate transactions and two separate delivery windows.

This product is intended strictly for laboratory research use only. It is not approved for human consumption, therapeutic application, or diagnostic purposes.