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Glp3 vs GLP-1

You are deciding between two options.

Reference and calculator, not medical advice. Dosing figures below are transcribed from FDA-approved prescribing information and link back to it. Last reviewed August 2026.

Searching this expecting a comparison will not produce one, because only one of the two exists. GLP-1 is a hormone with seven medications targeting it. GLP-3 is not a hormone, not a drug class, and not a thing under development.

The belief is easy to arrive at honestly. Almost everything else in medicine that carries a number does escalate — drug generations, treatment lines, device versions. Applied to a hormone family it simply does not hold: the number records position on the precursor protein, and there are only two glucagon-like fragments on it.

What proglucagon actually produces

GLP-1 and GLP-2 are both cut from the same precursor protein. This is the complete list of what that protein yields.

There is no GLP-3. The numbering stops at two because only two glucagon-like peptides are produced. No such hormone appears in the physiology literature, and a search of the FDA drug label database returns zero results for it.

Where the name does show up is in marketing. A product described as GLP-3, or as a next-generation successor to GLP-1, is using a name with no regulatory or scientific meaning. That is worth treating as information about the seller rather than about the product.

Side-by-side

Structural facts from each product’s prescribing information.

ProductActive ingredientIndicationFrequencyStartMax labelledSteps to max
Zepbound
Eli Lilly		TirzepatideWeight managementWeekly2.5 mg15 mg6
Wegovy
Novo Nordisk		SemaglutideWeight managementWeekly0.25 mg2.4 mg5
Wegovy tablets
Novo Nordisk		Semaglutide (oral)Weight managementDaily1.5 mg25 mg4

Common questions

What comes after GLP-1 then?
Not a higher number — additional targets. Tirzepatide adds GIP to GLP-1. Other combinations under investigation add glucagon. The naming reflects which hormones are targeted, not a version sequence.
Is GLP-2 the "next one" instead?
GLP-2 exists but does something unrelated: it acts on the intestine and its approved analogue treats short bowel syndrome. It is not a stronger GLP-1.

Sources and last review

Every dosing figure on this page is transcribed from an FDA-approved label and links back to it. Conversions are arithmetic you can repeat by hand. Nothing here is reviewed by a clinician, and this site does not employ one — which is exactly why what I do publish stays traceable to its source.

Transcribed from the labels above and checked by me — Gavin, who builds this site, takes a GLP-1, and is not a clinician. Last reviewed August 2026. Found an error? [email protected] — I treat corrections as bugs. How this site is built and funded.

Citing this page

The figures here are transcribed from FDA-approved labels and each links to its source. If you are writing about this, quote the label rather than this site where you can — and if this page saved you the transcription, a link is appreciated.

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