For research purposes only. Retatrutide is a research peptide not approved for human use. All pricing data is pulled live from vendor catalogs and updated automatically.
Retatrutide has become one of the most studied peptides in the GLP-1 receptor agonist category. As a triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneously, it has attracted significant attention in metabolic research. This guide covers where to source it, how vendors compare on price and testing quality, and how to get the best value.
What Is Retatrutide?
Retatrutide (also called GLP-3 or triple agonist) is a synthetic peptide that activates three receptors involved in metabolic regulation: GLP-1 (glucagon-like peptide-1), GIP (glucose-dependent insulinotropic polypeptide), and glucagon receptors. This triple mechanism is what distinguishes it from dual agonists like Tirzepatide.
It was developed by Eli Lilly and has been studied in Phase 2 and Phase 3 clinical trials. Research into its metabolic effects has made it one of the most searched peptides in the research community in 2025–2026.
This peptide is for research use only and is not approved for human consumption or therapeutic use.
What to Look for When Buying Retatrutide
Before comparing prices, the most important factor is testing documentation. Retatrutide is a complex peptide — synthesis quality varies significantly between manufacturers, and impurities are difficult to detect without proper testing.
What good testing looks like:
- Purity (HPLC) — Confirms the peptide is what it claims to be and measures concentration. Look for ≥98% purity.
- Endotoxin testing — Bacterial endotoxins are a byproduct of peptide synthesis and are harmful even in small quantities. This is non-negotiable for serious research.
- Heavy metals — Less common but increasingly standard among top-tier vendors.
A Certificate of Analysis (COA) should be batch-specific and issued by an independent third-party lab — not the manufacturer themselves.
Current Retatrutide Prices by Vendor
Prices below are live, pulled directly from vendor catalogs. Price per mg is the most useful comparison metric since vial sizes vary.
| Vendor | Listing | List price | Per mg |
|---|---|---|---|
| Peptide Supply Co | 10 × 60mg | $800 | Retatrutide.33 |
| Proved Peptides | 10 × 30mg | $550 | Retatrutide.83 |
| Crush Research | 10 × 30mg | $599 | $2.00 |
| Glacier Aminos | 10 × 60mg | Retatrutide,307.94 | $2.18 |
| PeptidePlugs | 5 × 30mg | $337.50 | $2.25 |
| Puratek Peptides | 30mg | $89.95 | $3.00 |
| Peptide Partners | 20 × 24mg | Retatrutide,512 | $3.15 |
| Modern Aminos | 60mg | $224.25 | $3.74 |
| Virtus Peptides | 10mg | $41 | $4.10 |
| Forge Performance | 30mg | Retatrutide44 | $4.80 |
| Orbitrex | 36mg | Retatrutide79.99 | $5.00 |
| Regenerative Research | 30mg | Retatrutide80 | $6.00 |
| Real Peptides | 10mg | $62.40 | $6.24 |
| PADRE Research | 15mg | $95 | $6.33 |
| Revitalized Research | 15mg | Retatrutide24.99 | $8.33 |
List prices before discounts, each vendor's lowest price per mg. For real totals with multi-vial discounts, discount codes and shipping, see Retatrutide prices.
Use the The Peptide Plug optimizer to calculate the best price for your specific research quantity including promo codes, vial size combinations, and volume discounts.
Vendor Breakdown
Glacier Aminos
US-based vendor carrying Retatrutide in multiple vial sizes. Publishes full COAs covering purity, endotoxin, sterility, heavy metals, and conformity — one of the most comprehensive testing protocols available. Ships domestically.
Orbitrex
US-based with full third-party testing. Orbitrex uses QR-coded vials linking directly to the batch COA, which makes verification straightforward. Their Retatrutide is listed under the code "3G-RT."
Peak Peptide
EU-based vendor with strong testing standards. A good option for European researchers. Their Retatrutide is listed as "G-Triple" on their storefront. Prices are in EUR.
Crush Research
Well-established US vendor with a consistent track record. Full independent COAs on every product including heavy metals. Carries multiple vial sizes.
Peptide Supply Co
US-based with purity and endotoxin testing. Ships quickly with a good reputation for customer service. No heavy metals testing on file currently.
Blank Peptides
US-based vendor with strong testing credentials — Freedom Diagnostics lab, HPLC + LC-MS, averaging 99.57% purity across their catalog. Carries Retatrutide in multiple sizes.
How to Get the Best Price
Promo codes — Most vendors offer affiliate discount codes. These are tracked on The Peptide Plug and applied automatically in the optimizer.
Vial size — Buying larger vials typically reduces price per mg significantly. The price per mg difference between the smallest and largest available vial can be substantial — use the optimizer to compare across sizes.
Volume discounts — Some vendors offer tiered pricing for purchasing 5+ vials. These are factored into The Peptide Plug optimizer automatically.
Use the optimizer — The Peptide Plug price comparison tool calculates the true best price for your exact quantity, factoring in vial size combinations, volume tiers, promo codes, and shipping. It updates automatically as vendor prices change.
Retatrutide vs Tirzepatide for Research
Researchers often compare these two given their structural similarities. The key difference is that Retatrutide activates the glucagon receptor in addition to GLP-1 and GIP — giving it a triple mechanism vs Tirzepatide's dual mechanism.
In terms of sourcing, Tirzepatide is currently available at lower price per mg from most vendors, partly due to higher production volumes. Retatrutide tends to command a premium. If budget is a constraint for your research, Tirzepatide may be worth comparing.
Frequently Asked Questions
Is Retatrutide legal to buy?
Retatrutide is legal to purchase for legitimate research purposes in the United States. It is not FDA-approved for human use and should only be handled by qualified researchers in appropriate settings.
What purity should I look for?
≥98% purity by HPLC is the standard for research-grade peptides. The vendors listed above all meet or exceed this threshold based on their published COAs.
How should Retatrutide be stored?
Lyophilized (freeze-dried) peptides should be stored at -20°C and protected from light. Once reconstituted, store at 4°C and use within a reasonable timeframe per your research protocol.
Which vendor has the best testing?
All US vendors listed on The Peptide Plug are independently third-party tested for purity and endotoxins — that's a baseline requirement for inclusion. Some vendors go beyond that standard: Glacier Aminos, for example, uses a 7-point protocol that adds sterility, conformity, and heavy metals testing on top of the baseline. We continuously monitor vendor testing standards and prioritize vendors who go above and beyond what the industry typically requires.