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Research overview · For research use only

GLP-1 Peptides

What the research actually investigates across the GLP-1 receptor-agonist class — semaglutide, tirzepatide, and retatrutide — and a side-by-side of vetted vendors for laboratory sourcing.

What are GLP-1 peptides?

GLP-1 (glucagon-like peptide-1) receptor agonists are a class of peptides studied extensively in metabolic research. They are among the most-searched compounds in the peptide space. Note that several molecules in this class exist as FDA-approved prescription medications in clinical settings; the research-peptide market sells them strictly as research materials — not as drugs, supplements, or products for human use.

Research framing. Everything below describes what published studies and clinical trials have investigated. It is not health advice, not a description of what you should take, and not a recommendation to use any GLP-1 compound. Prescription versions of these molecules should only be used under the care of a licensed clinician.

The three most-studied molecules

The class is best understood by how many receptors each molecule engages:

For the primary research, see the retatrutide Phase 2 trial in the New England Journal of Medicine and the comparative tirzepatide vs semaglutide network meta-analysis (NIH/PMC).

Why this category dominates search

GLP-1 molecules sit at the center of the metabolic-research conversation, which makes them the highest-demand category in the peptide space. That demand is exactly why sourcing quality — verified purity and batch-specific COAs — matters most here.

Legal status (2026)

The compounding landscape for several peptides shifted in 2026. Read our breakdown of the FDA reclassification and what it means for sourcing: The 2026 FDA Peptide Reclassification, Explained.

Updated monthly · For research use only

Where to buy GLP-1 compounds — compared

Buy directly from vetted research-peptide vendors below. Each product ships from the vendor and is sold strictly for laboratory and research use — not for human consumption. Links are affiliate links, disclosed per FTC guidelines; you pay the same price.

Research use onlyZestyRat Research GLP-1 (Semaglutide) research vial
ZestyRat Research

GLP-1 (Semaglutide)

10 / 20 / 30 mg options
$79.99 starting★ Most purchased
Buy at ZestyRat →
Use code SHAUN10 at checkout — 10% off
Most ordered through this site — every reader order delivered, zero issues reported
Research use onlyCD
CD Biolab

Semaglutide

Metabolic / GLP-1 research
$69 / vial★ #2 · US lab
Order at CD Biolab →
99%+ HPLC · COA every batch
US lab · fast domestic shipping · real phone/text support
Research use onlyORB
Orbitrex Peptides

Semaglutide (1G-SGT)

GLP-1 metabolic research · ≥99%
$69.99 startingFinnrick A
Buy at Orbitrex →
Use code UNCAGED at checkout — 10% off
Finnrick A · QR-COA every vial · same-day UPS
Research use onlyAC
Amino Club

GLP-3 (RT)

99%+ purity · ISO 17025 COA
$69.99 starting99%+ guaranteed
Buy at Amino Club →
Use code SHAUN22 at checkout
99%+ purity guarantee · ISO 17025 COAs · free ship $150+
Research use onlyGLP-1 Research Lab Semaglutide (GLP-1) research vial
GLP-1 Research Lab

Semaglutide (GLP-1)

10 mg · ≥99%
$57.50 /10 mgSpecialist
Buy at GLP-1 Lab →
Free FedEx 2-day cold-chain shipping
GLP-1 specialist · 6-pack $50/vial + free bac water
Research use onlyGLP-1 Research Lab Tirzepatide (GLP-1/GIP) research vial
GLP-1 Research Lab

Tirzepatide (GLP-1/GIP)

30 mg · dual agonist
$180 /30 mgBest value
Buy at GLP-1 Lab →
Free FedEx 2-day cold-chain shipping
GLP-1 specialist · 6-pack $50/vial + free bac water
Research use onlyGLP-1 Research Lab Retatrutide (Tri-Agonist) research vial
GLP-1 Research Lab

Retatrutide (Tri-Agonist)

30 mg · triple agonist
$150 /30 mg
Buy at GLP-1 Lab →
Free FedEx 2-day cold-chain shipping
GLP-1 specialist · 6-pack $50/vial + free bac water
Research use onlyMP
Midwest Peptide

GLP-3 RT (Retatrutide)

Metabolic research
$79.99 startingLab-tested
Buy at Midwest →
Use code UNCAGED · free shipping · 5% off with Zelle
COA every batch · 4.9★ Trustpilot (166 reviews) · free shipping
Research use onlySP
Spartan Peptides

GLP-1 (Semaglutide)

Metabolic research
$179 startingCOA-forward
Buy at Spartan →
Signed third-party lab COAs · 60-day cookie
HPLC + mass-spec on every product · documentation-forward
Research use onlyDP
Dynamic Peptides

Semaglutide

GLP-1 metabolic · >99%
$59.99 10mgGMP/ISO
Buy at Dynamic Peptides →
COA with every product · 30-day cookie
HPLC + MS tested >99% · WHO/GMP + ISO 9001:2015 · 24–48hr US ship
Research use onlyPPL
Pinnacle Peptide Labs

Semaglutide (GLP-1)

GLP-1 metabolic research · ≥99%
$49.99 startingcGMP US
Buy at Pinnacle →
US cGMP lab · third-party tested · free ship $149+ · next-day dispatch
Research use onlyAP
Ascension Peptides

GLP-1 (Sema / Tirz / Reta)

Triple-tested · premium
$65 startingPremium · account required
Buy at Ascension →
Triple-verified purity · public COA library
The trust benchmark — 4.7★, zero contamination reports
VendorFromPurity3rd-party COAShipping
ZestyRat Research★ Most purchased $79.9999%+Independent · on requestUS domestic Buy →
CD Biolab★ #2 · US lab $6999%+Every batch · on requestUS domestic Buy →
Orbitrex PeptidesFinnrick A $69.99≥99%✓ QR-COA every vialUS · same-day Buy →
GLP-1 Research LabSpecialist $57.50≥98%✓ HPLC + MSUS · 1–2 days Buy →
GLP-1 Research LabBest value $180≥98%✓ HPLC + MSUS · 1–2 days Buy →
GLP-1 Research Lab $150≥98%✓ HPLC + MSUS · 1–2 days Buy →
Midwest PeptideLab-tested $79.9999%+✓ Every batchUS · free Buy →
Spartan PeptidesCOA-forward $179HPLC✓ Per-productUS Buy →
Amino Club99%+ guaranteed $69.9999%+✓ ISO 17025US · free $150+ Buy →
Dynamic PeptidesGMP/ISO $59.99>99%✓ COA every productUS · 24–48hr Buy →
Pinnacle Peptide LabscGMP US $49.99≥99%Independent · COA on requestUS · next-day Buy →
Ascension PeptidesMost trusted $6599.4%✓ Triple-verifiedUS · UPS Buy →

Prices are starting points and change often. Every outbound buy link is an affiliate link, disclosed per FTC guidelines. Products listed are for laboratory and research purposes only — not for human consumption.

Common questions

GLP-1 FAQ

What is tirzepatide as a GLP-1 research peptide?

Tirzepatide is a dual GLP-1/GIP receptor agonist — it engages two incretin receptors instead of one, which is why it's among the most-studied molecules in the GLP-1 research-peptide category. In the research market it's sold strictly for laboratory research use only, not for human consumption. When sourcing tirzepatide for research, demand batch-specific third-party COAs and verified purity — our top GLP-1 picks are Onyx Biolabs (independent HPLC + Mass Spec, public COAs) and ZestyRat Research.

What's the difference between semaglutide, tirzepatide, and retatrutide?

They differ by how many receptors they engage. Semaglutide is a single GLP-1 agonist; tirzepatide is a dual GLP-1/GIP agonist; retatrutide is an investigational triple GLP-1/GIP/glucagon agonist. Retatrutide is not FDA-approved as of 2026.

Are GLP-1 peptides legal to buy?

Prescription versions are FDA-approved medications dispensed by clinicians. The research-peptide market sells these molecules strictly for research use only — not for human consumption. Always verify a vendor's COAs and sourcing.

How do I evaluate a GLP-1 research vendor?

Demand batch-specific third-party COAs, transparent purity testing, U.S. sourcing, and a verifiable reputation. Purity matters most in this high-demand category. Our vendor reviews check all of these.

Does Peptides Uncaged sell GLP-1 peptides?

No. We're an independent research and comparison resource. We link to vetted third-party vendors and disclose every affiliate relationship.

Sources & further reading

Last reviewed June 2026. By the Peptides Uncaged Research Team.

New research, new vendor scores — first.

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