GLP-1: What It Is and How It Works
GLP-1 is a natural hormone your body makes whenever you eat. Think of it as your internal appetite and blood-sugar manager. When food hits your small intestine, special cells there release GLP-1 into your bloodstream. People use synthetic versions of this hormone to treat diabetes and help with weight loss because it's incredibly good at keeping your body balanced after meals.
Here's how it actually works: once GLP-1 is circulating, it travels throughout your body sending signals to multiple places. In your pancreas, it tells your insulin-producing cells to release insulin—but only when your blood sugar is actually high, so you don't crash. At the same time, it hits the brakes on a hormone called glucagon that would normally raise your blood sugar, creating a smart double-action system. In your stomach, GLP-1 slows digestion, which means glucose enters your bloodstream more gradually instead of spiking. Up in your brain, it activates the parts that make you feel full and satisfied, reducing hunger and cravings. It even has protective effects on your heart and blood vessels. The catch is that your body naturally breaks down GLP-1 within minutes, which is why doctors developed longer-lasting versions that keep working throughout the day.
Dosage Information
Typical Dose
N/A — native GLP-1 used as reference; pharmaceutical analogs used clinically
Frequency
N/A
Administration
Reference compound — see Semaglutide or Liraglutide for clinical use
Half-Life
1–2 minutes
Notes
Native GLP-1 is not used therapeutically due to its 2-3 minute half-life. This entry provides mechanistic context for the GLP-1 receptor agonist class.
Why this matters
Natural GLP-1 is rapidly degraded by DPP-4; this is why analogs like semaglutide were developed.
Where does GLP-1 sit?
See how this peptide compares across all 150 peptides in our database.
Evidence Score
0.69
Compound Data
Molecular Formula
C149H226N40O45
Molecular Weight
3297.60 g/mol
IUPAC Name
(4S)-5-[[2-[[(2S,3R)-1-[[(2S)-1-[[(2S,3R)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[2-[[(2S)-5-amino-1-[[(2S)-1-[[(2S)-1-[[(2S)-6-amino-1-[[(2S)-1-[[(2S)-1-[[(2S,3S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-6-amino-1-[[2-[[(2S)-1-amino-5-carbamimidamido-1-oxopentan-2-yl]amino]-2-oxoethyl]amino]-1-oxohexan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-4-carboxy-1-oxobutan-2-yl]amino]-1-oxohexan-2-yl]amino]-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-2-oxoethyl]amino]-4-carboxy-1-oxobutan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-3-carboxy-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-2-oxoethyl]amino]-4-[[(2S)-2-[[(2S)-2-amino-3-(1H-imidazol-4-yl)propanoyl]amino]propanoyl]amino]-5-oxopentanoic acid
PubChem CID
16133831Potential Side Effects
GLP-1 discussions
Quick Facts
- Administration
- Reference compound — see Semaglutide or Liraglutide for clinical use
- Typical Dose
- N/A — native GLP-1 used as reference; pharmaceutical analogs used clinically
- Frequency
- N/A
- References
- 0 curated + 50 from PubMed
- Clinical Trials
- 47 registered
- Evidence Score
- 0.7 / 100
Frequently Asked Questions about GLP-1
What is GLP-1?
Glucagon-like Peptide-1 (GLP-1) is an endogenous incretin hormone secreted by L-cells in the small intestine in response to food intake. It plays a central role in glucose homeostasis, appetite regulation, and pancreatic beta-cell function. While native GLP-1 has a very short half-life of 2-3 minutes due to rapid degradation by DPP-4 enzymes, it is the template for a family of long-acting pharmaceutical analogs including semaglutide and liraglutide that have become blockbuster treatments for diabetes and obesity. Understanding native GLP-1 physiology is essential context for the entire GLP-1 receptor agonist therapeutic class.
How does GLP-1 work?
GLP-1 is released postprandially and acts on GLP-1 receptors throughout the body. In the pancreas it stimulates glucose-dependent insulin secretion and inhibits glucagon release, lowering blood glucose without causing hypoglycemia at normal glucose concentrations. In the stomach it slows gastric emptying, reducing the rate of glucose absorption. In the hypothalamus and brainstem it activates satiety circuits and reduces appetite. GLP-1 also has direct cardioprotective effects through receptors in the heart and vasculature, promoting vasodilation and reducing inflammation. In the liver it suppresses hepatic glucose production. Native GLP-1 is rapidly inactivated by dipeptidyl peptidase-4 (DPP-4), which led to the development of DPP-4 inhibitors and long-acting GLP-1 analogs as therapeutic strategies.
What is the recommended dosage for GLP-1?
The typical dose is N/A — native GLP-1 used as reference; pharmaceutical analogs used clinically. N/A. Administration: Reference compound — see Semaglutide or Liraglutide for clinical use. Native GLP-1 is not used therapeutically due to its 2-3 minute half-life. This entry provides mechanistic context for the GLP-1 receptor agonist class.
What are the side effects of GLP-1?
N/A for native GLP-1 — see pharmaceutical analogs for side effect profiles
Questions reflect common community inquiries. This is not medical advice.