SERMORELIN COMPOUND // FAQ
Frequently Asked Questions About Sermorelin
Direct, cited answers to the questions readers actually ask — mechanism, regulatory status, safety, and comparisons.
How does sermorelin work to stimulate growth hormone production?
Sermorelin is the 1-29 N-terminal fragment of GHRH and binds GHRH receptors on pituitary somatotrophs, activating adenylate cyclase / cAMP / PKA signaling to stimulate the pituitary's own pulsatile growth hormone release [8]. Somatostatin and IGF-1 feedback are left intact, so the natural pulsatile pattern is preserved rather than overridden.
Is sermorelin FDA approved?
Sermorelin acetate was previously FDA-approved (NDA 020443) for idiopathic growth hormone deficiency / short stature in children and was withdrawn from the US market in 2008 for commercial reasons, not safety or efficacy [7]. It is not a currently-marketed FDA-approved finished drug; it is now prepared by compounding pharmacies.
Why was the branded sermorelin product discontinued?
The branded sermorelin product (NDA 020443) was withdrawn from the US market in 2008 for commercial reasons rather than any safety or efficacy concern [7]. A 2009 clinical review documented the resulting absence of recombinant GHRH in the United States and its diagnostic consequences, including alternative stimulation testing for adult growth hormone deficiency.
Is sermorelin legal?
Sermorelin is not a controlled substance under the Controlled Substances Act. It is treated as a long-standing Category 1 bulk drug substance under FDA's interim Section 503A compounding policy (final guidance January 2025) [13], and it is prohibited in sport by WADA as a growth hormone secretagogue (S2). Scheduling, compounding, and anti-doping are three separate questions.
What is sermorelin?
Sermorelin (sermorelin acetate, GHRH(1-29)NH2) is a synthetic 29-amino-acid analog of growth hormone-releasing hormone, the shortest GHRH fragment that retains full activity at the GHRH receptor, and a pituitary growth hormone secretagogue [9]. Its molecular weight is 3357.9 Da and its CAS number is 86168-78-7.
What does sermorelin do to the body?
By acting upstream on the pituitary rather than supplying exogenous growth hormone, sermorelin stimulates the body's own pulsatile growth hormone release and downstream hepatic IGF-1 production while preserving somatostatin and IGF-1 negative feedback [10]. The feedback loops stay operative, which is the structural argument made for the secretagogue approach.
Does sermorelin work?
In its approved pediatric setting, once-daily subcutaneous GHRH(1-29) accelerated first-year height velocity from about 4.1 to roughly 7-8 cm/year in growth-hormone-deficient children [1]; in older men, 14 days of twice-daily dosing raised 24-hour growth hormone and IGF-1 back toward young-adult levels [2]. "Works" is specific to the endpoint and population studied.
How long does it take for sermorelin to work?
A single GHRH(1-29) dose elevates serum growth hormone for roughly three hours despite rapid plasma clearance [3]. Measurable growth hormone and IGF-1 changes in older men were reported after 14 days [2], and pediatric height-velocity gains were measured over the first year of therapy [1]. The endocrine response is fast; the clinical readouts span weeks to a year.
How does sermorelin compare to CJC-1295?
Sermorelin is native GHRH(1-29) with a very short (~10-12 minute) plasma half-life; CJC-1295 is a longer-acting GHRH analog built on the same axis [3]. Incorporating D-Ala2 into GHRH(1-29)NH2 and adding DAC albumin-binding technology was shown to extend half-life and reduce metabolic clearance — the structure-activity basis behind the longer-acting analogs.
Sermorelin vs ipamorelin: what is the difference?
Sermorelin is a GHRH analog acting on the GHRH receptor, whereas ipamorelin is a growth-hormone-releasing peptide that acts on the separate ghrelin / GHS receptor [8]. They engage two different secretagogue mechanisms within the same growth hormone axis — GHRH input versus ghrelin-receptor input.
What is sermorelin used for?
Its historical FDA-approved indication was the evaluation and treatment of growth hormone deficiency / short stature in children [1]. In research it has also been studied in adult GH-axis aging, cognition, sleep, and body-composition contexts [6], with the related analog tesamorelin studied for HIV-associated fat accumulation. This is documented study and approval history, not a treatment recommendation.
Does sermorelin actually help with sleep, or is it waking me up instead?
GHRH has documented sleep-promoting (slow-wave sleep) effects in normal men, and growth hormone is secreted in pulses particularly during slow-wave sleep [8]. Sleep-endocrine effects depend on the time of administration, which is part of why nocturnal dosing is studied. Individual experience varies; this describes the endocrine literature, not a predicted outcome.
Why is it recommended to inject sermorelin at night?
Endogenous growth hormone is released in pulses, especially during slow-wave sleep, so studies have administered GHRH-axis agents at bedtime to align with the natural nocturnal growth hormone pulse [8]; sleep-endocrine responses to GHRH are time-of-administration dependent. This describes study protocols, not a dosing recommendation.
Does sermorelin burn fat?
Pulsatile growth hormone contributes to lipolysis regulation, and GHRH-axis stimulation with the related analog tesamorelin reduced visceral adipose tissue versus placebo in clinical trials; a body-fat reduction was also seen alongside the cognition trial [6]. Anti-aging and body-composition marketing nonetheless outpaces the direct evidence for sermorelin itself.
Is sermorelin effective for weight loss?
The body-composition evidence centers on visceral-fat reduction with the stabilized analog tesamorelin rather than general weight loss with sermorelin itself; authorities caution that secretagogue use for aging and body composition is not yet established [5], so claims here should be read conservatively.
Does sermorelin affect testosterone?
Sermorelin acts on the growth hormone / IGF-1 axis, not the gonadal axis; the dealt literature documents its effects on growth hormone and IGF-1 [2] and does not establish a direct testosterone-raising effect. IGF-1 elevation is the measured downstream endpoint.
Will sermorelin raise my IGF-1 levels?
Raising growth hormone drives hepatic IGF-1 production: twice-daily GHRH(1-29) raised IGF-1 in older men toward young-adult levels [2], and a related GHRH analog increased IGF-1 by 117% within the physiologic range in a controlled trial [6].
Does sermorelin build muscle?
Direct muscle-hypertrophy trials of sermorelin are not part of the dealt evidence; reviews situate GH/IGF-1-axis modulation among candidate strategies against age-related muscle loss (sarcopenia), but a 2026 orthopaedics review stresses that clinical-trial evidence for such peptides is still lacking [14].
How does sermorelin differ from direct HGH injections?
Sermorelin acts upstream on the pituitary to stimulate the body's own pulsatile growth hormone release with feedback intact, whereas recombinant HGH supplies exogenous hormone directly [10]; an editorial argued the secretagogue approach may be more physiologic for adult-onset growth hormone insufficiency [4].
Does sermorelin affect the brain?
In controlled trials, GHRH administration had a favorable effect on cognition in older adults and modulated brain GABA levels in mild cognitive impairment and healthy aging [6], indicating central effects of GHRH-axis stimulation.
Can sermorelin or GHRH improve cognition in older adults?
A randomized, double-blind, placebo-controlled trial of 152 older adults found 20 weeks of a daily GHRH analog had a favorable effect on cognition (P=0.03; executive function P=0.005) [6], with an earlier controlled study reporting improved cognition in healthy older adults.
What are the side effects of sermorelin?
Across the dealt trials adverse events were generally mild [6]; because growth hormone and IGF-1 are mitogenic, chronically raising them is theorized to carry oncologic risk, and long-term safety data for adult anti-aging use remain limited. Authorities judged secretagogue use for aging "not yet ready for prime time" [5].