
Ipamorelin: The Peptides Came First, Then the Receptor, Then the Hormone
GHRP-6 was reported in 1984, its receptor found in 1996 and the body's own hormone for it in 1999. The hormone that came last reclassified the whole family.
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Growth hormone peptides for research: GHRH analogs, GH secretagogues and IGF-1 analogs acting along the growth hormone pathway.
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>99%About this category
None of the peptides in this category is growth hormone itself: they are studied along the hypothalamic-pituitary somatotropic pathway, from GH-releasing signals through to the downstream IGF-1 response. CJC-1295 and Sermorelin act as GHRH receptor agonists, prompting the anterior pituitary to release growth hormone directly, while Ipamorelin and GHRP-6 work through the separate ghrelin receptor to produce a pulsatile GH spike. In conscious swine, Ipamorelin did not raise ACTH or cortisol the way GHRP-6 and GHRP-2 did. IGF-1 LR3 extends the pathway a step further: a recombinant analog engineered with an N-terminal substitution that resists IGFBP binding, giving researchers a longer-acting tool for in vitro IGF-1 signaling work.
Research and reference
An evidence review and a handling reference for each compound, kept off the product pages so neither is cut short.
Family overviewsGrowth Hormone Secretagogues ResearchIGF-1 Family Research
CJC-1295 (No DAC) ResearchCJC-1295 (No DAC) Reference
CJC-1295 With DAC ResearchCJC-1295 With DAC Reference
GHRP-2 ResearchGHRP-2 Reference
GHRP-6 ResearchGHRP-6 Reference
Hexarelin ResearchHexarelin Reference
Ipamorelin ResearchIpamorelin Reference
Sermorelin ResearchSermorelin Reference
Tesamorelin ResearchTesamorelin Reference
Fragment 176-191 ResearchFragment 176-191 Reference
IGF-1 DES ResearchIGF-1 DES Reference
IGF-1 LR3 ResearchIGF-1 LR3 Reference
MGF (Mechano Growth Factor) ResearchMGF (Mechano Growth Factor) Reference
PEG-MGF ResearchPEG-MGF ReferenceFrom the blog

GHRP-6 was reported in 1984, its receptor found in 1996 and the body's own hormone for it in 1999. The hormone that came last reclassified the whole family.

Sermorelin held two full US approvals. Both are gone. A 2013 FDA finding states plainly that neither left the market for safety or efficacy reasons.

IGF-1 LR3 outperforms native IGF-1 where binding proteins are present and underperforms it where they are absent. The same experiment shows both.

The trials that won tesamorelin its approval were sponsor-funded, as approval trials are. What happened next is the part worth paying attention to.
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