Ghrelin is an endogenous ligand for the growth hormone (GH) secretagogue receptor (GHSR). Ibutamoren (MK-677) is an orally-active, non-peptidic agonist of GHSR and, as a result, is a GH secretagogue. It elevates GH in dogs after oral doses as low as 0.125 mg/kg, without significantly changing plasma levels of aldosterone, luteinizing hormone, thyroxine, or prolactin.
GHRP-6 is an effective stimulator of natural Growth Hormone Release from the anterior pituitary. GHRP-6 is also a ghrelin/growth hormone receptor agonist and one of a handful of ghrelin analogues developed in the last several decades. It has been found to have positive effects on heart muscle cells, memory formation, scar formation, sex motivation, and the neurons involved in Parkinson’s disease. GHRP-6 is orally and sublingually active and moderately to highly selective.
GHRP-2 is a synthetic growth hormone secretagogue that binds to the ghrelin/growth hormone secretagogue receptor. It has been shown in research trials to improve muscle growth, regulate the immune system, and improve sleep cycles. GHRP-2 research has shown that it has oral bio-activity.
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