GLP-1 vs GLP-2: Two Different Gut Hormones, Explained
GLP-1 and GLP-2 sound like versions of the same thing, but they are two different gut hormones with different jobs. This page explains what each one does, and why the GLP-2 medicine, teduglutide (Gattex), treats short bowel syndrome rather than weight.
Why the names cause confusion
GLP stands for glucagon like peptide. The body makes both GLP-1 and GLP-2 in the gut, releasing them after eating, and they are cut from the same starting material, which is why their names and origins are so similar. That is where the resemblance mostly ends. Each hormone has its own receptors, its own main job, and its own family of medicines, and one cannot be swapped for the other.
The confusion has grown because GLP-1 medicines became famous for weight loss, and anything with GLP in the name now attracts attention, including online products that borrow the GLP-2 name for gut health or repair claims. Reading the number after GLP as a version number, as if GLP-2 were the upgrade, is the core mistake this page exists to correct. It is a different hormone, not a newer edition.
What GLP-1 does
GLP-1 is the hormone behind medicines such as Ozempic, Wegovy, Mounjaro and Zepbound. After a meal it helps the pancreas release insulin when blood sugar is high, it reduces appetite signals, and it slows how quickly the stomach empties. Medicines that activate the GLP-1 receptor copy and extend those effects, which is why they are used for type 2 diabetes and for weight management. Nearly everything on this site is about GLP-1, and the how GLP-1 works guide covers it in full.
What GLP-2 does
GLP-2 is focused on the intestine itself. Its job is growth, maintenance and repair of the gut lining: it supports the structures that absorb food, increases blood flow to the intestine, and helps the bowel take in more fluid and nutrients from what passes through. Where GLP-1 tells the body to eat less and handle sugar differently, GLP-2 tells the remaining intestine to absorb more of what is eaten. For a healthy person with a full intestine that difference is background biology. For someone whose intestine is too short to absorb enough nutrition, it is the whole problem.
The GLP-2 medicine: teduglutide (Gattex)
The approved GLP-2 based medicine is teduglutide, sold as Gattex and made by Takeda. Teduglutide is a GLP-2 analog, a manufactured copy designed to last longer than the natural hormone, given as a daily injection. Its FDA approved use is the treatment of short bowel syndrome in adults and in children aged 1 year and older who are dependent on parenteral support, meaning they need nutrition or fluids delivered by vein because their remaining intestine cannot absorb enough on its own.
Short bowel syndrome usually follows surgical removal of a large part of the intestine. By helping the remaining bowel grow and absorb more, teduglutide aims to reduce how much intravenous nutrition a person needs. It is a specialist hospital medicine for a rare and serious condition, managed by expert teams, and its label carries its own monitoring requirements and warnings, including follow up examinations of the intestine. Nothing about its label concerns weight loss, appetite or diabetes.
Side by side
| GLP-1 | GLP-2 | |
|---|---|---|
| Main job | Insulin support, appetite reduction, slower stomach emptying | Growth, repair and absorption in the intestine |
| Example medicine | Semaglutide (Ozempic, Wegovy) | Teduglutide (Gattex) |
| Approved for | Type 2 diabetes and weight management | Short bowel syndrome needing intravenous nutrition |
| Effect on food | You eat less of it | The gut absorbs more of it |
Why this distinction matters in practice
Because the uses do not overlap, a GLP-2 product is not an alternative to a GLP-1 medicine, a stronger form of one, or a way to heal the gut while losing weight. Gattex is a prescription medicine for one defined condition, prescribed and monitored by specialists. Products marketed online under the GLP-2 name for general gut repair, athletic recovery or wellness are not the approved medicine and have no approved use behind them, and buying prescription grade peptides from such sellers carries the same unverified contents risk as any other unapproved product.
If a clinician mentions GLP-2 at all, it will almost always be in the short bowel context. If your interest is appetite, blood sugar or weight, the hormone you mean is GLP-1, and your own doctor is the right person to discuss the medicines built on it.
Frequently asked questions
Is GLP-2 a newer or stronger version of GLP-1?
No. GLP-1 and GLP-2 are two different hormones that the gut releases after eating. GLP-1 mainly affects insulin, appetite and stomach emptying. GLP-2 mainly supports the growth and absorptive capacity of the intestine itself. The number is part of the name, not a version or strength rating.
What is the GLP-2 medicine used for?
The approved GLP-2 medicine is teduglutide, sold as Gattex. It is FDA approved for short bowel syndrome in adults and children aged 1 year and older who depend on parenteral support, meaning intravenous nutrition or fluids, because their remaining intestine cannot absorb enough. It is a specialist medicine, not a general gut health product.
Can GLP-2 help with weight loss?
No. GLP-2 works in the opposite direction, helping the intestine absorb more nutrients and fluid, and no GLP-2 medicine is approved for weight loss, appetite control or diabetes. Weight management medicines are built on GLP-1, sometimes combined with other gut hormone pathways, never on GLP-2.
Is Gattex related to Ozempic?
Only distantly. Both are manufactured copies of natural gut hormones, given by injection, but they copy different hormones and treat unrelated conditions. Ozempic copies GLP-1 and treats type 2 diabetes. Gattex copies GLP-2 and treats short bowel syndrome. One cannot substitute for the other.
Why do GLP-1 and GLP-2 have such similar names?
Because they are related in origin. Both are glucagon like peptides, cut from the same starting material and released by the same gut cells after meals. Similar origins and names hide very different jobs, receptors and medicines, which is why the two are so often confused.