Sermorelin Dosage: A Discontinued Drug With a Second Life

Sermorelin is the first 29 amino acids of growth hormone-releasing hormone — the shortest fragment that retains full activity. It is unusual among the peptides discussed in research circles because it was once an approved medicine, marketed as Geref, before being withdrawn from the US market in the late 2000s.

That withdrawal is widely reported as a commercial decision rather than a safety action, which is why a labelled dose exists for it at all when most research peptides have none.

What it does

Sermorelin binds the GHRH receptor in the pituitary and prompts release of growth hormone the body already makes. Like ipamorelin, it is a secretagogue rather than a hormone — the ceiling is set by pituitary capacity, not by how much you introduce.

The practical consequence is that it preserves the pulsatile pattern of natural GH release, where administering growth hormone directly does not. That distinction is the main argument made for secretagogues generally.

How it differs from CJC-1295

Sermorelin and CJC-1295 are both GHRH analogues, and the difference is durability rather than mechanism.

CJC-1295 without DAC is essentially sermorelin with amino acid substitutions that resist enzymatic breakdown. See the CJC-1295 and ipamorelin guide for why the DAC distinction changes everything about how a blend behaves.

The vial math

Sermorelin is supplied lyophilised, commonly in 5 mg or 10 mg vials, and figures discussed in research contexts are in micrograms — so the diluent choice decides whether a target lands at a readable number of units.

The pattern is the same one that applies to every low-microgram peptide: more diluent gives larger, more forgiving unit readings for the same amount. The peptide calculator handles any combination.

Why timing is discussed

Growth hormone is released in pulses, the largest during early deep sleep, and a compound with a 10–20 minute half-life acts entirely within a narrow window. That is the mechanistic basis for the before-sleep and fasted-window protocols that circulate — a reasonable inference from how the system behaves, not a finding from a human dose-timing trial.

Food, particularly fat and carbohydrate, blunts the GH response, which is the other half of the same rationale.

Storage

Storage is the same as any reconstituted vial: 2–8 °C, protected from light, never frozen, and bounded by the shorter of peptide stability and the 28-day limit on bacteriostatic water. The bacteriostatic water guide covers the detail.

Frequently asked questions

Why was sermorelin withdrawn if it was approved?

Reporting attributes the withdrawal to commercial factors rather than a safety finding. That is a meaningful distinction, but "withdrawn for business reasons" is still not the same as "currently approved and monitored".

Is sermorelin the same as HGH?

No. HGH is the hormone; sermorelin prompts your pituitary to release its own. The resulting pattern, and the ceiling, are different.

How does it compare with tesamorelin?

Both are GHRH analogues, but tesamorelin remains an approved drug for a specific indication and has a longer half-life. See the tesamorelin guide.