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Weight loss peptide

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.

The most important thing to know about "weight loss peptides" as a category is that it is not one. Every GLP-1 medication on this site is itself a peptide — semaglutide and tirzepatide both are. So the question is never peptide versus GLP-1; it is which specific peptide, and whether it is an approved product with a label you can read or something sold outside that framework entirely.

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.

That distinction is where the real divide sits. Products marketed under peptide branding span a range from FDA-approved drugs through compounded preparations to research chemicals sold with no approval at all — and several sold for body composition have been placed by the FDA in a category flagged for significant safety risk. Those are not variations in quality within one category; the first has prescribing information and the last has none.

Two different regulatory paths

Which one a product travelled determines what had to be proved before it could be sold.

Prescription drug
FDA reviews safety and efficacy before it can be sold. Carries prescribing information with dosing, contraindications and adverse-reaction rates. Every medication on this site.
Dietary supplement
No FDA approval before sale. The manufacturer is responsible for its own safety substantiation, and structure/function claims carry a disclaimer stating the product is not intended to diagnose, treat, cure or prevent disease. Products sold as GLP-1 "support", "booster" or "daily".

This is a description of two legal pathways, not a judgement about any product. A supplement being on the supplement path is not a criticism of it — it is the reason the two categories cannot be compared on a price-per-month basis the way two prescription options can.

Three questions that settle it for any brand

New products appear constantly. These work on all of them.

Side-by-side

Structural facts from each product’s prescribing information.

ProductActive ingredientIndicationFrequencyStartMax labelledSteps to max
Zepbound
Eli Lilly		TirzepatideWeight managementWeekly2.5 mg15 mg6
Mounjaro
Eli Lilly		TirzepatideType 2 diabetesWeekly2.5 mg15 mg6
Wegovy
Novo Nordisk		SemaglutideWeight managementWeekly0.25 mg2.4 mg5
Wegovy tablets
Novo Nordisk		Semaglutide (oral)Weight managementDaily1.5 mg25 mg4
Ozempic
Novo Nordisk		SemaglutideType 2 diabetesWeekly0.25 mg2 mg4
Rybelsus
Novo Nordisk		Semaglutide (oral)Type 2 diabetesDaily3 mg14 mg3
Saxenda
Novo Nordisk		LiraglutideWeight managementDaily0.6 mg3 mg5
Trulicity
Eli Lilly		DulaglutideType 2 diabetesWeekly0.75 mg4.5 mg4

Common questions

Are research peptides the same molecules?
A product sold for research use is not sold as a medicine, is not dispensed against a prescription, and carries no prescribing information. Whatever is in the vial, there is no label defining its dose or its adverse reaction profile.
Why does this site not compare specific ones?
Because it only publishes figures that trace back to a prescribing information document. For products without one there is nothing to transcribe, and inventing a comparison would be exactly the thing this site exists not to do.
Is semaglutide a peptide?
Yes — which is why the framing of the question rarely survives contact with the answer. The approved GLP-1 medications are peptide drugs that went through FDA review.

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.

Also searched as: fat loss peptide · best fat loss peptide

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