Peptides vs GLP-1 for weight loss
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.
For weight loss specifically, the list of peptides with an FDA-approved label for that purpose is short and consists entirely of GLP-1 medications. Everything else marketed as a weight-loss peptide is being sold for a use no approved label supports.
Side-by-side
Structural facts from each product’s prescribing information.
| Product | Active ingredient | Indication | Frequency | Start | Max labelled | Steps to max |
|---|---|---|---|---|---|---|
| Zepbound Eli Lilly | Tirzepatide | Weight management | Weekly | 2.5 mg | 15 mg | 6 |
| Wegovy Novo Nordisk | Semaglutide | Weight management | Weekly | 0.25 mg | 2.4 mg | 5 |
| Wegovy tablets Novo Nordisk | Semaglutide (oral) | Weight management | Daily | 1.5 mg | 25 mg | 4 |
| Saxenda Novo Nordisk | Liraglutide | Weight management | Daily | 0.6 mg | 3 mg | 5 |
What "Peptides" actually is
Not a category with a shared meaning. Marketed peptide products range from FDA-approved drugs to compounded preparations to research chemicals sold without approval.
- FDA-approved medication
- No
- Approved for
- Depends entirely on the specific peptide. Several sold for body composition — including BPC-157 — have been placed by the FDA in a category flagged for significant safety risk.
- Difference that matters
- GLP-1 medications are themselves peptides. The question is not peptide versus GLP-1, but which specific peptide, and whether it is an approved product with a label you can read.
This page describes what each thing is and what it is approved for. It does not compare how well they work, because that is a question for a prescriber with your history in front of them.
The peptides most often sold alongside weight-loss programmes — BPC-157, TB-500, CJC-1295, ipamorelin — are not marketed as weight-loss agents in any approved labelling, because none of them has approved labelling. Their claimed effects concern recovery, tissue repair or growth hormone release, and none has an FDA-reviewed dossier for body composition.
This matters more than usual here because the two often arrive together. A telehealth service selling a compounded GLP-1 may also sell peptides from that second group, presented in the same catalogue with the same visual authority, despite standing in a completely different regulatory position.
Common questions
- What about peptides that boost your own GLP-1?
- No approved product makes that claim. Where a seller does, ask which molecule and which trial — the answer usually resolves it quickly.
- Is liraglutide a peptide too?
- Yes, and an approved one, labelled for weight management as Saxenda. It is daily rather than weekly, which is the main practical difference from the newer options.
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.
- Zepbound (Tirzepatide) prescribing information — Eli Lilly, label revised 6 May 2026, checked 7 August 2026
- Wegovy (Semaglutide) prescribing information — Novo Nordisk, label revised 30 June 2026, checked 7 August 2026
- Saxenda (Liraglutide) prescribing information — Novo Nordisk, label revised 15 June 2026, checked 7 August 2026
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.
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