Sermorelin.
Work with your body's own clock.
A growth hormone-releasing hormone analog that supports your body's natural GH production. Not synthetic growth hormone — a signal that tells your pituitary to do what it already knows how to do. Compounded in the USA by licensed 503A pharmacies. No hidden overseas supply chain.
What is sermorelin?
Sermorelin is a GHRH (growth hormone-releasing hormone) analog — a compound that mimics the natural signal your hypothalamus sends to your pituitary gland to release growth hormone. It's not synthetic GH itself. It's the upstream signal that tells your body to produce more of its own.
Growth hormone production naturally declines with age, starting around your 30s. Sermorelin is designed to support that declining output by working with your body's existing feedback loops rather than bypassing them entirely.
Sermorelin was FDA-approved as Geref for pediatric growth hormone deficiency (Geref was discontinued in 2008 per publicly available manufacturer statements, for commercial rather than safety reasons). Its adult off-label use has a smaller and primarily observational safety record. Sermorelin remains legal to compound in the U.S. and is prescribed by licensed clinicians through PepScribe, then compounded in the USA by a licensed 503A pharmacy.
Is sermorelin right for you?
Sermorelin may be a good fit if your goals center around recovery, sleep, and long-term body composition rather than weight management alone.
Your PepScribe clinician determines eligibility based on your health history, labs (if applicable), and goals. The assessment is free and takes about 3 minutes.
How sermorelin works
GHRH pathway stimulation
Sermorelin binds to GHRH receptors on the pituitary and triggers a GH pulse. Because the pituitary is still regulated by somatostatin, there's a physiological ceiling on how much GH the pituitary will release — unlike exogenous recombinant hGH, which bypasses that feedback. Timing sermorelin at bedtime aligns the induced pulse with the body's largest natural GH pulse during slow-wave sleep.
Daily injection, before bed
Subcutaneous injection, typically administered before bedtime. This timing aligns with your body's natural GH pulse during deep sleep. Small insulin-style needle — most patients say it becomes routine within a few days.
What to expect early on
Sleep quality improvements are often among the first things patients notice. Recovery and body composition changes tend to develop more gradually over weeks to months. Sermorelin works with your body's own production, so effects build over time.
What to expect
Sermorelin works with your body's own systems, so changes tend to be gradual. Here's what patients commonly report.
Sleep deepens
Many patients report falling asleep faster and sleeping more deeply within the first few weeks. You may notice waking up feeling more rested, with less grogginess in the morning. This is often the first signal that the pituitary is responding.
Recovery accelerates
During this period, sleep improvements often consolidate, and some patients report subjective recovery benefits. Rigorous adult RCTs of sermorelin for exercise recovery or skin outcomes specifically have not been completed — these patient-reported observations aren't substitutes for trial data. IGF-1 response is typically checked around this window.
Cumulative effects
At this stage, patients often report continuing improvements in sleep quality and recovery. Body-composition and energy effects in the published adult-use literature are modest and variable; randomized trials specific to these outcomes in adults have not been completed. Your clinician monitors IGF-1 levels and response over time, and adjusts protocol accordingly.
Individual results may vary. Timelines are based on commonly reported patient experiences and are not guaranteed outcomes.
Side effects — what to know
Sermorelin has an established safety profile from its time as a commercially available product. Most side effects are mild.
Common (generally mild)
- •Injection site reactions — redness, swelling, or itching at the injection area
- •Headache
- •Flushing or warmth after injection
- •Dizziness
Less common
- •Temporary numbness or tingling
- •Arthralgia (joint aches)
- •Fluid retention or mild edema
- •Carpal tunnel symptoms
- •Transient changes in insulin sensitivity or glucose tolerance (your clinician may monitor fasting glucose, HbA1c, or IGF-1)
Many GH-class concerns — fluid retention, carpal tunnel, insulin sensitivity changes — have been described primarily in higher-dose recombinant GH use. Sermorelin's feedback-regulated mechanism appears to reduce but not eliminate these risks. Your clinician will review baseline labs and monitor on therapy.
Contraindications
- •Active malignancy or history of hormonally responsive cancers
- •Pregnancy or breastfeeding
- •Known hypersensitivity to sermorelin or to preservatives used in preparation
- •Uncontrolled diabetes or significant insulin resistance (clinician evaluates case-by-case)
- •Pituitary disorders that may limit response or require alternative approaches
Talk to your clinician if any side effects persist or concern you. Sermorelin is generally well-tolerated, but your clinician can adjust dosing if needed.
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Deep dives on Sermorelin
Research-backed articles covering specific topics in depth.
Sermorelin Therapy: A Patient's Guide to Candidacy & Protocols
Sermorelin: Comprehensive patient-facing explainer covering mechanism of action, candidacy criteria, and what to expect from sermorelin therapy, differe...
How Sermorelin Works: Mechanism & Benefits
Sermorelin: Evidence-based breakdown of sermorelin's mechanism of action and clinically observed benefits, distinguishing it from synthetic HGH with cit...
See if sermorelin is right for you.
A quick assessment to see if sermorelin is right for you. No commitments. No pressure. Takes about 3 minutes.
Get started with sermorelinResearch references
Corpas, Harman & Blackman (Journal of Clinical Endocrinology & Metabolism, 1992) — GHRH administration raises GH and IGF-1 in healthy older adults. Obal & Krueger (Sleep Medicine Reviews, 2004) — GHRH's role in slow-wave sleep regulation. Full trial summaries and additional citations on the sermorelin research hub.
Compounded medications are prepared by licensed pharmacies and are not FDA-approved. All prescriptions require approval by a licensed healthcare provider. Individual results may vary.