Sermorelin // The Original GHRH
The original growth hormone-releasing hormone analog — the first 29 amino acids of natural GHRH that retain full biological activity. FDA-approved for diagnostic use and the most prescribed GH peptide in anti-aging clinics worldwide. Nightly dosing amplifies the natural nocturnal GH pulse that declines with age.
Amplifying the pulse your pituitary already makes.
Sermorelin is bioidentical to the first 29 amino acids of endogenous GHRH(1-44). It binds the GHRH receptor on somatotroph cells in the anterior pituitary, amplifying the natural GH pulse — particularly the large nocturnal surge during Stage 3 deep sleep. Because it works through the body's own feedback loops, it can't cause supraphysiological GH levels the way exogenous HGH can. The pituitary self-regulates.
One shot before bed. Let your pituitary do the work.
Sermorelin is dosed as a single nightly injection on an empty stomach (2+ hours after eating). The timing matters — you want the peptide to amplify the natural nocturnal GH pulse that occurs 1–2 hours after sleep onset during deep N3 sleep. Eating before dosing blunts the GH response due to insulin-mediated somatostatin release.
Decades of clinical data behind every injection.
Sermorelin (Geref) was developed by Serono Laboratories and received FDA approval for diagnostic evaluation of pituitary function. It became the cornerstone of the anti-aging medicine movement after clinicians observed that GH-deficient adults showed significant improvements in body composition, sleep quality, recovery, and skin health with nightly administration.
Clinical studies demonstrate that sermorelin increases mean 24-hour GH secretion by 2–3x in GH-deficient adults without exceeding physiological limits. Unlike exogenous HGH, sermorelin cannot cause supraphysiological GH levels because the pituitary's own feedback mechanisms remain intact — somatostatin still functions as the natural brake.
Long-term data shows sustained benefits over 6–12 months without significant adverse effects. The compound has one of the longest safety track records of any GH secretagogue, making it the default starter recommendation in most anti-aging protocols.
Sermorelin vs. the next generation.
| Compound | Type | Half-Life | Frequency | Strength |
|---|---|---|---|---|
| Sermorelin | GHRH | ~10–20 min | 1x nightly | Moderate |
| CJC-1295 (no DAC) | GHRH | ~30 min | 1–3x daily | Strong |
| CJC-1295 (DAC) | GHRH | ~6–8 days | 1x weekly | Sustained |
| Tesamorelin | GHRH | ~26 min | 1x daily | Strong (FDA) |
| Ipamorelin | GHRP | ~2 hours | 1–3x daily | Moderate |
What to watch for.
Sermorelin's side effect profile is manageable with proper protocol adherence. Baseline blood work before starting and periodic monitoring during use is essential.
- Injection site redness or irritation (most common, transient)
- Facial flushing and warmth (GHRH vasodilation, passes in minutes)
- Headache (mild, dose-dependent)
- Dizziness (transient)
- Difficulty swallowing (rare)
- Vivid dreams (improved sleep architecture)
- IGF-1 (primary efficacy marker — check at baseline, 6 weeks, 12 weeks)
- Fasting glucose and insulin
- HbA1c (every 3–6 months)
- Thyroid panel (TSH, Free T3, Free T4)
- Cortisol (morning draw)
- CBC and CMP (baseline monitoring)
- GH stimulation test (if clinically indicated)
- Body composition (DEXA) at baseline and 12 weeks
- Commonly paired with Ipamorelin (GHRH + GHRP synergy)
- BPC-157 for tissue repair enhancement
- DSIP for sleep optimization synergy
- Do NOT combine with CJC-1295 (redundant GHRH signals)
- Do NOT combine with exogenous HGH
- Fasting 2+ hours before dosing is critical for response
- Lyophilized: refrigerate at 2–8°C (36–46°F)
- Reconstituted: refrigerate, use within 14–21 days
- Protect from light and heat
- Do not freeze reconstituted solution
- Shorter stability than CJC-1295 after reconstitution
- Pharmaceutical grade available via compounding pharmacies
Compounds that complement Sermorelin.
The tried-and-true entry point for GH optimization.
Sermorelin has the longest clinical track record of any GH secretagogue. It's not the strongest — CJC-1295 and the GHRPs produce more GH output. But it's the safest, most prescribed, and most well-understood option available. If you're new to GH peptides, this is where most clinicians will start you. Dose it before bed on an empty stomach, pair it with Ipamorelin if you want stronger output, and track your IGF-1 every 6–12 weeks. The improvements in sleep, recovery, and body composition are gradual but consistent.
Our free Protocol Guide includes the complete Sermorelin + Ipamorelin protocol — nightly timing, dosing, IGF-1 optimization targets, and blood work tracking.