Ghrelin vs GLP-1

Ghrelin and GLP-1 are opposing gut hormones. Ghrelin rises before meals and stimulates hunger and GH release; GLP-1 is released after eating to boost insulin secretion, slow gastric emptying and signal fullness.

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Ghrelin

The endogenous 28-amino-acid stomach hormone that activates the growth-hormone secretagogue receptor — the natural ligand every synthetic secretagogue imitates.

BEST STUDIED FOR

GH secretagogues

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GLP-1

The native 30-amino-acid incretin hormone from intestinal L-cells that every GLP-1 receptor agonist imitates.

BEST STUDIED FOR

Incretin & metabolic

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SIDE BY SIDE

	Ghrelin	GLP-1
The key difference	Hunger signal from the stomach	Satiety signal from the gut
Class	GH secretagogues	Incretin & metabolic
Mechanism	Discovered in 1999 as the natural ligand of GHS-R1a, acylated ghrelin stimulates pituitary GH release and is a powerful orexigenic (appetite) signal.	GLP-1 is cut from proglucagon in gut L-cells and some brainstem neurons.
Status	Endogenous hormone and research tool; synthetic ghrelin-receptor agonists (anamorelin, macimorelin) have reached approval in specific indications elsewhere.	Endogenous hormone and research reference; long-acting analogues (semaglutide, liraglutide, dulaglutide, tirzepatide) are approved medicines.
Reported safety signals	As a research reagent it is a physiological hormone; increased appetite and GH/cortisol release are expected pharmacology.	Native GLP-1 is too short-lived for therapeutic use; class effects of its analogues are gastrointestinal first.
A key study	The discovery paper identifying ghrelin as the endogenous, acylated ligand of the GH secretagogue receptor. (Nature 1999, PMID 10604470)	A foundational review of GLP-1 production from proglucagon and its physiological actions. (Physiol Rev 2007, PMID 17928588)

WHEN TO RESEARCH WHICH

Ghrelin is studied for appetite and GH physiology; GLP-1 for glucose control and satiety — together they frame the gut–brain appetite axis. Both are discussed here strictly as research compounds; nothing on this page is medical advice or a dosing guide.

REFERENCES (PUBMED)

[Ghrelin] Ghrelin is a growth-hormone-releasing acylated peptide from stomach — Nature 1999. PMID 10604470
[Ghrelin] Ghrelin — Mol Metab 2015. PMID 26042199
[Ghrelin] Ghrelin and Neurodegenerative Disorders-a Review — Mol Neurobiol 2017. PMID 26809582
[GLP-1] The physiology of glucagon-like peptide 1 — Physiol Rev 2007. PMID 17928588
[GLP-1] Glucagon-like peptide 1 (GLP-1) — Mol Metab 2019. PMID 31767182
[GLP-1] Glucagon-like peptide-1 (GLP-1) signalling in the brain: From neural circuits and metabolism to therapeutics — Br J Pharmacol 2022. PMID 34519026

FREQUENTLY ASKED

What is the difference between Ghrelin and GLP-1?

What is the regulatory status of Ghrelin and GLP-1?

Ghrelin: Endogenous hormone and research tool; synthetic ghrelin-receptor agonists (anamorelin, macimorelin) have reached approval in specific indications elsewhere. GLP-1: Endogenous hormone and research reference; long-acting analogues (semaglutide, liraglutide, dulaglutide, tirzepatide) are approved medicines.

What safety signals have been reported?

Ghrelin: As a research reagent it is a physiological hormone; increased appetite and GH/cortisol release are expected pharmacology. GLP-1: Native GLP-1 is too short-lived for therapeutic use; class effects of its analogues are gastrointestinal first.

Which studies is this comparison based on?

For Ghrelin: “Ghrelin is a growth-hormone-releasing acylated peptide from stomach” (PMID 10604470); “Ghrelin” (PMID 26042199); “Ghrelin and Neurodegenerative Disorders-a Review” (PMID 26809582). For GLP-1: “The physiology of glucagon-like peptide 1” (PMID 17928588); “Glucagon-like peptide 1 (GLP-1)” (PMID 31767182); “Glucagon-like peptide-1 (GLP-1) signalling in the brain: From neural circuits and metabolism to therapeutics” (PMID 34519026).