Retatrutide Price Guide 2026: How Much Does It Cost?
Retatrutide is the most-watched peptide compound of 2026 — a triple-receptor agonist that activates GLP-1, GIP, and glucagon pathways simultaneously, and the only compound to show average weight loss exceeding 24% of body weight in Phase 2 clinical trials. It is not yet FDA-approved and is sold for research purposes only. This guide covers what research-grade retatrutide costs today, which suppliers carry it, and what to expect as the market evolves ahead of potential approval.
Current Retatrutide Research Peptide Prices
Prices below are sourced from supplier websites and updated nightly by our automated tracker. Fewer suppliers currently carry retatrutide compared to established peptides like semaglutide or BPC-157. All prices are in USD.
Small Vials (5–10mg)
| Supplier | Size | Price | Price / mg | Location |
|---|---|---|---|---|
| Spectrum Peptides Best Value | 5mg | $83.99 | $16.80/mg | USA |
| Spectrum Peptides Best /mg Small | 10mg | $165.99 | $15.99/mg ↓ best | USA |
| Peptide Lab | 10mg | $150.00 | $15.00/mg | USA |
Bulk Vials (15–60mg) — Peptide Lab
| Size | Price | Price / mg | vs. 10mg rate |
|---|---|---|---|
| 15mg | $200.00 | $13.33/mg | 11% cheaper/mg |
| 20mg | $250.00 | $12.50/mg | 17% cheaper/mg |
| 30mg | $300.00 | $10.00/mg | 33% cheaper/mg |
| 40mg | $300.00 | $7.50/mg | 50% cheaper/mg ★ |
| 50mg | $350.00 | $7.00/mg | 53% cheaper/mg |
| 60mg | $400.00 | $6.67/mg | 56% cheaper/mg |
What Is Retatrutide?
Retatrutide (Eli Lilly compound designation: LY3437943) is a synthetic peptide that simultaneously agonizes three distinct receptors: the glucagon-like peptide-1 receptor (GLP-1R), the glucose-dependent insulinotropic polypeptide receptor (GIPR), and the glucagon receptor (GcgR). This triple-agonist mechanism sets it apart from every GLP-1 drug currently on the market.
Tirzepatide (Mounjaro, Zepbound), currently the most effective approved weight-loss drug, activates two receptors: GLP-1 and GIP. Retatrutide adds glucagon receptor activation, which increases energy expenditure — essentially accelerating the body's calorie-burning rate on top of the appetite suppression and insulin-sensitizing effects of the first two pathways.
Retatrutide Clinical Trial Results
Retatrutide's Phase 2 data published in the New England Journal of Medicine (2023) made it one of the most-discussed compounds in metabolic medicine:
Retatrutide vs. Semaglutide vs. Tirzepatide
| Property | Semaglutide | Tirzepatide | Retatrutide |
|---|---|---|---|
| Receptor targets | GLP-1 | GLP-1 + GIP | GLP-1 + GIP + Glucagon |
| Developer | Novo Nordisk | Eli Lilly | Eli Lilly |
| FDA approval status | Approved (Ozempic, Wegovy) | Approved (Mounjaro, Zepbound) | Phase 3 — Not approved |
| Phase 2 avg. weight loss | ~15–17% | ~20–22% | ~24% (highest dose) |
| Dosing frequency | Once weekly | Once weekly | Once weekly (trials) |
| Brand-name Rx price/mo | $800–$1,100 | $900–$1,200 | Not available (unapproved) |
| Research peptide (10mg) | ~$130–$200 | ~$100–$180 | ~$150–$166 |
Is Retatrutide Legal to Buy?
In the United States, retatrutide is not FDA-approved and is not a scheduled controlled substance. Research peptide suppliers sell it legally as a research chemical for laboratory use only, with explicit "not for human consumption" labeling. It is not legal to sell it as a drug or for therapeutic purposes without FDA approval.
Because retatrutide is actively in clinical development by Eli Lilly, the research chemical market operates somewhat differently from compounds with no pharmaceutical development pathway. Eli Lilly holds patents on retatrutide; research chemical suppliers synthesize their own versions independently, which is common practice in the research peptide industry.
WADA has not specifically listed retatrutide on its prohibited list as of 2026, though its GLP-1 agonist activity means it could fall under existing prohibited substance categories. Competitive athletes should seek specific guidance from their sport's anti-doping authority.
Notable Research Suppliers (2026)
Spectrum Peptides
Peptide Lab
What to Look for in a Retatrutide Supplier
Retatrutide is a longer, more structurally complex peptide than most in the research market. Quality verification is especially important:
- Third-party HPLC and mass spectrometry data — Sequence identity verification via mass spec is more critical for retatrutide than for shorter, simpler peptides. The correct molecular weight is approximately 4680 Da. A COA that only shows HPLC purity without mass confirmation is insufficient for a peptide of this complexity.
- Sequence confirmation — Retatrutide's triple-agonist activity depends on its specific amino acid sequence and modifications. Request documentation confirming the sequence matches the published LY3437943 structure.
- Named independent testing lab — The testing laboratory should be identifiable by name, not just by logo or "in-house" claims.
- Storage and shipping conditions — Lyophilized powder should be shipped with appropriate cold packs or temperature indicators. Retatrutide should be stored refrigerated (2–8°C) and kept away from light.
Frequently Asked Questions
How much does retatrutide cost in 2026?
Research-grade retatrutide currently ranges from $83.99 for a 5mg vial (Spectrum Peptides) to $165.99 for a 10mg vial (also Spectrum). Peptide Lab offers larger bulk sizes up to 60mg at prices as low as $6.67/mg. The market has limited supplier competition, which keeps prices higher than more established peptides. Use our live price comparison tool for current figures.
Will retatrutide become cheaper over time?
Almost certainly yes, as more suppliers enter the market and synthesis processes mature. Tirzepatide research peptide prices fell significantly between 2022 and 2026 as it became more widely available. Retatrutide is likely to follow the same curve, with the fastest price drops occurring once Eli Lilly receives FDA approval (if successful) and public awareness spikes demand that brings more suppliers in.
Is retatrutide available as a prescription medication?
No. As of April 2026, retatrutide is not FDA-approved and is not available as a prescription drug in the United States. Eli Lilly is conducting Phase 3 TRIUMPH trials, and no NDA submission has been made. There is no legal route to obtain pharmaceutical retatrutide outside of a clinical trial.
How does retatrutide's glucagon receptor action help with weight loss?
The glucagon receptor, when activated, increases the liver's glucose output and raises the body's basal metabolic rate — it effectively increases energy expenditure. In isolation, glucagon activation can cause hyperglycemia, which is why glucagon agonists haven't been developed standalone. When combined with GLP-1 agonism (which lowers blood glucose and suppresses appetite) and GIP agonism (which enhances insulin sensitivity), the three pathways balance each other. The net result is increased calorie burning without the blood sugar spike that pure glucagon activation would cause.
What supplies are needed for retatrutide research?
Standard peptide research supplies: bacteriostatic water for reconstitution, insulin syringes (29–31 gauge, 1cc), alcohol prep pads, and a sharps container. These are available on Amazon. See our peptide supplies section for curated options.
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