An FDA-approved GHRH analog used for GH deficiency diagnosis and treatment, with a favorable safety profile.
Sermorelin (GHRH 1-29 NH2) is a synthetic analog of the first 29 amino acids of endogenous growth hormone-releasing hormone (GHRH). It was FDA-approved for the diagnosis of GH deficiency in children and is widely used off-label for adult GH optimization. Sermorelin is the shortest fully active fragment of GHRH, retaining the complete biological activity of the 44-amino acid native hormone. Its relatively short half-life (10–20 minutes) results in more physiological GH pulsatility compared to exogenous recombinant HGH, which produces supraphysiological and non-pulsatile GH levels. By working through the pituitary’s natural regulatory mechanisms (including somatostatin feedback), sermorelin cannot produce the excessive GH levels associated with exogenous HGH, making it a safer approach to GH optimization. It is often combined with Ipamorelin for synergistic GH release.
* Benefits based on preclinical/animal research unless otherwise noted.
Sermorelin binds to the GHRH receptor (GHRHR) on somatotroph cells in the anterior pituitary — a Gs-coupled GPCR. GHRHR activation elevates cAMP via adenylyl cyclase, which activates PKA and triggers GH gene transcription and pulsatile GH secretion. The pituitary’s natural somatostatin feedback mechanism remains intact with sermorelin, preventing excessive GH accumulation and maintaining physiological pulsatility. Sermorelin also stimulates pituitary cell proliferation and GH synthesis over time, potentially restoring pituitary GH reserve that has declined with age. Unlike exogenous HGH, sermorelin-stimulated GH release is subject to normal hypothalamic regulation, including suppression by hyperglycemia and stimulation by sleep and exercise, preserving the natural GH secretory pattern.
Protocol Notes: Bedtime administration maximizes the natural GH pulse during sleep. Administer on an empty stomach. Often combined with Ipamorelin.
Add 3 mL bacteriostatic water to 9 mg vial → 3 mg/mL For 300 mcg dose: draw 0.1 mL (10 units on U-100 syringe)
When sourcing Sermorelin for research purposes, the following quality benchmarks should be verified before use.
Store at room temperature, away from light and moisture.
Lyophilized: refrigerate. Reconstituted: refrigerate and use within 30 days.
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Moderate Evidence — Multiple animal studies and/or early human trials. Reasonable confidence in mechanism, but human data is limited.
Peptides commonly used alongside Sermorelin for synergistic effects.
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