# Sermorelin — dosage, half-life & reference guide | PepVault

Source: https://pepvault.app/peptides/sermorelin

Last updated: 2026-10-12

[Library](https://pepvault.app/peptides) [Growth hormone](https://pepvault.app/peptides#growth-hormone) reviewed October 2026

# Sermorelin Dosage, half-life & reference guide

Also known as GHRH 1-29 · GRF 1-29

A synthetic copy of the first 29 amino acids of your natural growth hormone releasing hormone: it prompts your pituitary to release its own GH, keeping the body's feedback loops in play.

- **Studied range:** 200–500 mcg starting dose 200 mcg
- **How often:** Daily
- **Half-life:** ~11–12 min
- **Evidence:** Established
- **Route:** SubQ injection

Studied in research — not a recommendation.

[Sermorelin dose guide](https://pepvault.app/lab/dosage/sermorelin)

## How it works.

Synthetic analogue of endogenous GHRH. Stimulates the pituitary to produce and secrete GH naturally. Considered a more physiological approach to GH optimization compared to exogenous GH.

**Commonly reported:** Deeper sleep and vivid dreams in the first weeks, with gentle, slow-building effects, milder than CJC/ipamorelin. It was FDA-approved as a diagnostic test (1990) and to treat GH deficiency in children (1997) until the maker discontinued it in 2008, not for safety reasons.

### Half-life & active level

The half-life of Sermorelin is ~11–12 min (US Geref label, after IV or SubQ).

Here's how a typical Sermorelin schedule plays out over 48 hours (one-compartment estimate).

An estimate from the half-life above, not a measurement. See your own curve build live in [the half-life calculator](https://pepvault.app/tools/peptide-half-life-calculator).

## Where Sermorelin works.

- ### Brain, nerves & sleep

  **Reported by users.** Commonly reported: sleep improves first, often within the first week, with vivid dreams.
- ### Skin & hair

  **Reported by users.** Commonly reported: measurable body-composition changes and better skin by now.
- ### Muscle

  **Reported by users.** Commonly reported in weeks 2 to 6: faster recovery from training, better skin and deeper, longer sleep.

An area lights for what a peptide is used for and what people report, with the evidence beside it. It isn’t a promise that it works there.

## Week by week.

What to expect in the first 8 weeks

- **Onset:** 1–2 weeks
- **Peak effect:** 3–6 months
- **Duration:** 3–6 months

1. Day 1–14 Community

   ### Sleep is the first signal

   Sermorelin works through your own pituitary, so the first effects are subtle. Commonly reported: sleep improves first, often within the first week, with vivid dreams. Pre-bed dosing aims at your natural nighttime GH pulse.

   The science

   Sermorelin (GHRH 1-29) stimulates pituitary somatotrophs to release endogenous GH. Pre-sleep dosing aims to amplify the natural nocturnal GH pulse of the first hours of slow-wave sleep. FDA-approved as Geref (diagnostic from 1990; pediatric GH-deficiency treatment from 1997) until 2008.

   Sources

   - Walker (2006)
   - Federal Register (FDA) (2013)

   Updated Sep 2026
2. Day 14–42 Community

   ### Recovery and skin are responding

   Commonly reported in weeks 2 to 6: faster recovery from training, better skin and deeper, longer sleep. This is the slow-build phase; sermorelin rewards patience.

   The science

   Unlike synthetic GH, sermorelin works through the pituitary's own pulses and feedback loops, and IGF-1 rises gradually over weeks, not days. Whether that means better long-term pituitary health hasn't been studied.

   Sources

   - Walker (2006)

   Updated Sep 2026
3. Day 42–180 Clinical

   ### The long game is paying off

   Community protocols run 3–6 months. Commonly reported: measurable body-composition changes and better skin by now. Many anti-aging physicians prefer it because it works through your body's own GH regulation rather than overriding it.

   The science

   Sermorelin has 1–3 years of pediatric safety data (Prakash & Goa 1999), unusual for GH peptides; there are no multi-year adult data. The claim that a "pituitary training" effect outlasts dosing comes from an editorial citing rat work (Walker 2006); no human data show benefits persisting after stopping.

   Sources

   - Prakash & Goa (1999)
   - Walker (2006)

   Updated Sep 2026
4. Any day Clinical

   ### What Sermorelin is built on

   One of the few GH peptides with real FDA history: approved as Geref for GH-deficiency testing (1990) and treatment in children (1997), then discontinued in 2008 for non-safety reasons. A first-generation peptide that newer ones like CJC-1295 were built on; adult use rests on small GHRH trials in older adults.

   The science

   Sermorelin is the first 29 amino acids of endogenous GHRH (44 amino acids). FDA approvals covered diagnostic testing (1990) and treatment of idiopathic GH deficiency in children (1997); they were withdrawn in 2009 after the maker stopped production, and FDA determined in 2013 that this wasn't for safety or effectiveness reasons. The newer CJC-1295 added amino acid substitutions for improved half-life and potency, but sermorelin remains the most physiologically conservative option.

   Sources

   - Federal Register (FDA) (2013)
   - Prakash & Goa (1999)

   Updated Sep 2026
5. Any day Clinical

   ### Where Sermorelin sits in the GH family

   Sermorelin is the original GHRH analog — a near-exact copy of your own GHRH, which makes it the gentlest and most physiological of the family but also the shortest-acting (~10–20 minutes). CJC-1295 is essentially Sermorelin with stabilizing tweaks for a longer, more durable pulse; Tesamorelin is the longer, visceral-fat-focused GHRH with the most clinical data. If you want the lightest GHRH and don't mind a slower build, Sermorelin is the conservative pick.

   The science

   Sermorelin (GHRH 1-29, ~11–12 min half-life) is the native-sequence GHRH analog; CJC-1295/Mod GRF 1-29 adds substitutions for enzymatic resistance and a cleaner pulse; Tesamorelin is a stabilized GHRH analog FDA-approved for HIV lipodystrophy with the strongest visceral-fat data. All three are GHRH-side (baseline) agents typically paired with a GHRP for a fuller pulse. Positioning only — established pharmacology, no new claims.

   Sources

   - Walker (2006)

   Updated Sep 2026

Day 1 is the day you start it.

Formerly FDA-approved diagnostic and pediatric GH-deficiency treatment. Slower onset than Ipamorelin/CJC combos per community consensus.

Moderate evidence

## Mixing and a typical run.

Example numbers

### Reconstitution example

Reconstitute a 5 mg vial of Sermorelin with 2 mL of bacteriostatic water and a 200 mcg dose is 8 units on a U-100 syringe, about 25 doses per vial.

- **Vial:** 5 mg
- **Water:** 2 mL
- **Amount:** 200 mcg

Draw to **8 units**

0.3 mL insulin syringe · 30 units

[Mix it in the Reconstitution Lab](https://pepvault.app/lab) [Open the calculator](https://pepvault.app/tools/reconstitution-calculator)

### Run notes

- **Cycle:** 3–6 months common; considered a more physiological approach so longer cycles are used. Community practice — opinions vary. Not a clinical recommendation.
- **Timing:** Pre-sleep injection aligns with natural GH secretion. Fasted preferred.
- **Route:** SubQ injection
- **Stacks:** Ipamorelin, MOTS-c, BPC-157

## Safety.

### Common side effects

- Headache
- Flushing
- Dizziness
- Nausea
- Injection site reaction
- Water retention

## Goes with.

- [Ipamorelin](https://pepvault.app/peptides/ipamorelin)
- [MOTS-c](https://pepvault.app/peptides/mots-c)
- [BPC-157](https://pepvault.app/peptides/bpc-157)

## Compared with.

- [Sermorelin vs Tesamorelin](https://pepvault.app/peptides/compare/sermorelin-vs-tesamorelin)
- [Ipamorelin vs Sermorelin](https://pepvault.app/peptides/compare/ipamorelin-vs-sermorelin)

## Questions people ask.

### What is Sermorelin?

A synthetic copy of the first 29 amino acids of your natural growth hormone releasing hormone: it prompts your pituitary to release its own GH, keeping the body's feedback loops in play.

### How is Sermorelin dosed in research?

The research range for Sermorelin is 200–500 mcg, daily, before bed, with a 200 mcg starting dose. Studied in research — not a recommendation.

### How long does Sermorelin last?

The half-life of Sermorelin is ~11–12 min (US Geref label, after IV or SubQ).

### What do people report on Sermorelin?

Commonly reported on Sermorelin: deeper sleep and vivid dreams in the first weeks, with gentle, slow-building effects, milder than CJC/ipamorelin. It was FDA-approved as a diagnostic test (1990) and to treat GH deficiency in children (1997) until the maker discontinued it in 2008, not for safety reasons.

### Is Sermorelin safe?

The research basis for Sermorelin is established: clinical trials or FDA-approved use exists. Common side effects in the library: headache, flushing, dizziness, nausea, injection site reaction and water retention.

### What does Sermorelin stack with?

Common stacks for Sermorelin: Ipamorelin, MOTS-c and BPC-157.

## Research.

The literature

### Search the latest research

[PubMed](https://pubmed.ncbi.nlm.nih.gov/?term=Sermorelin) [Google Scholar](https://scholar.google.com/scholar?q=Sermorelin)

## Reference.

- **Cadence:** Daily Daily, before bed
- **Half-life:** ~11–12 min ~11–12 min (US Geref label, after IV or SubQ)
- **Research basis:** Established Clinical trials or FDA-approved use exists

## More growth hormone peptides

- [Tesamorelin 1–2 mg](https://pepvault.app/peptides/tesamorelin)
- [GHRP-2 100–300 mcg](https://pepvault.app/peptides/ghrp-2)
- [GHRP-6 100–300 mcg](https://pepvault.app/peptides/ghrp-6)
- [Hexarelin 100–200 mcg](https://pepvault.app/peptides/hexarelin)
- [MK-677 10–25 mg](https://pepvault.app/peptides/mk-677)
- [Fragment 176-191 250–500 mcg](https://pepvault.app/peptides/fragment-176-191)

## Free tools

- [Sermorelin dose guide](https://pepvault.app/lab/dosage/sermorelin)
- [Reconstitution Lab (3D)](https://pepvault.app/lab)
- [Injection guide (3D)](https://pepvault.app/lab/injection)
- [Peptide Sky (3D)](https://pepvault.app/lab/sky)
- [Peptide tier list](https://pepvault.app/lab/tiers)
- [Reconstitution calculator](https://pepvault.app/tools/reconstitution-calculator)
- [Half-life & active level](https://pepvault.app/tools/peptide-half-life-calculator)

PepVault for iPhone

## Track Sermorelin in PepVault

Log every dose, keep your vial and the doses left in it and watch its estimated active level. 7 days free on the yearly plan for new subscribers.

[Download on the App Store](https://apps.apple.com/app/apple-store/id6779318649?pt=129020030&ct=peptides-cta&mt=8)

[Open the calculator](https://pepvault.app/tools/reconstitution-calculator) [How the vial count works](https://pepvault.app/peptide-vial-tracker-app) [Explore the live demo](https://pepvault.app/login)

Reviewed October 2026 [How we check the library](https://pepvault.app/about#library)

PepVault is a research and tracking resource, not medical advice. Ranges are what studies used, never a dose for you. Brand names are trademarks of their owners; PepVault is independent of them.

PepVault is a private research and tracking tool, not medical advice. The information here is reference material from published literature and community use — always verify it and discuss any protocol with a qualified clinician before changing it.

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