Pituitary GH pulses → hepatic IGF-1 production → IGF-1R/mTOR anabolic signalling. Axis-level research vs direct GH injection or IGF-1 LR3 research
Research Questions Answered
What is Sermorelin?
Sermorelin (GHRH 1-29) is a 29-amino acid synthetic analogue of the first 29 residues of human GHRH (growth hormone-releasing hormone, which has 44 AA naturally). It retains full GHRH receptor binding and biological activity in the first 29 AA. Sermorelin was FDA approved as Geref (1997) for GH deficiency in children and GH secretion testing — making it the only GHRH analogue with a completed FDA approval history. It was discontinued commercially (not due to safety) when recombinant HGH became more widely available.
How does Sermorelin work?
Sermorelin binds the pituitary GHRH receptor (GHRHR) on somatotroph cells → activates cAMP/PKA signalling → GH gene transcription and GH secretion in physiological pulses. Unlike HGH (direct GH receptor activation), sermorelin acts upstream — stimulating the pituitary to produce its own GH in pulses, preserving the feedback regulation loop (high IGF-1 suppresses further GH release). This more physiological pattern is the key research advantage of GHRH analogues over exogenous HGH.
What is the difference between Sermorelin and CJC-1295?
Both are GHRH analogues but with different half-lives: Sermorelin (GHRH 1-29): ~10–20 minute half-life, produces shorter GH pulse, closer to physiological GHRH. CJC-1295 No DAC (modified GHRH 1-29): ~30 minute half-life via minor modifications. CJC-1295 with DAC: days-long half-life via albumin binding (DAC = Drug Affinity Complex). Sermorelin is the most physiological; CJC-1295 No DAC is the most commonly researched middle-ground; DAC form produces tonic GH elevation.
What is the difference between Sermorelin and Ipamorelin?
Different receptors: Sermorelin → GHRH receptor (GHRHR). Ipamorelin → GHS-R1a (ghrelin receptor). They activate GH release via independent, complementary pathways. Combined (Sermorelin + Ipamorelin), they are synergistic: GHRH increases pulse amplitude; GHS-R1a increases frequency. Ipamorelin adds the advantage of no cortisol/prolactin elevation.
Where can I buy Sermorelin for research?
Research-grade Sermorelin is available from QSC (qscpeptide.com) at ≥99% HPLC purity with Janoshik COA. US Domestic Warehouse: 2–4 business days. Research use only.
Was Sermorelin FDA approved?
Yes — Sermorelin acetate (Geref) was FDA approved by Serono in 1997 for: (1) long-term treatment of idiopathic GH deficiency in children, (2) as a diagnostic test for GH secretory capacity in adults. It was voluntarily discontinued in 2002 — not due to safety/efficacy concerns but due to commercial reasons as recombinant HGH became the dominant GHD treatment.
What is Sermorelin used for in research?
Sermorelin research applications: GHRH receptor pharmacology, pituitary GH axis biology, GH pulse characterisation, GH deficiency models, body composition research (GH-mediated lipolysis and anabolism), GH axis ageing research (somatopause models), and comparative GHRH analogue research (Sermorelin vs CJC-1295 vs Tesamorelin).
What is the Sermorelin half-life?
Sermorelin has a half-life of approximately 10–20 minutes. This produces brief GHRH receptor stimulation, generating a short GH pulse — most physiologically similar to endogenous GHRH pulsatility (which is also short). For longer GH axis stimulation, CJC-1295 (30 min) or Tesamorelin (extended) provide longer GHRHR activation.
What is Sermorelin storage?
Lyophilised Sermorelin: store at −20°C. Reconstituted: 4°C, use within 28 days. As a 29-AA peptide, Sermorelin requires careful storage. Reconstitute with bacteriostatic water.
How does Sermorelin compare to HGH for research?
HGH: exogenous somatotropin → direct GHR activation → suppresses natural GH axis via negative feedback. Sermorelin: pituitary GHRH stimulation → physiological pulsatile GH → preserves feedback regulation. Research question determines choice: HGH for direct GHR/IGF-1 biology; Sermorelin for pituitary axis biology and physiological GH pulse research.
Where to Buy Research-Grade Sermorelin
≥99% HPLC · Janoshik COA · US Domestic 2–4 Days · Research Use Only
