Retatrutide
The most talked-about weight-loss peptide in trials — it works on three pathways at once instead of one.
Also listed as Reta, LY-3437943, triple agonist.
Peptide Compare tracked 31 vendors selling Retatrutide on 10 Oct 2026. The cheapest in-stock 5 mg vial is $5.20 per mg at Modern Research, 53% under the $11.05 median. Prices are scraped from vendor sites; trust scores come from Finnrick blind tests.
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Best value right now · 5 mg
Modern Research
IN STOCKUNTESTED
Per mg53% under the $11.05 median
Vial price5 mg · verified Oct 10
Avg per mg · 5 mg
$16.26+5.3%
Ranged $15.44 – $22.03 across 31 vendorsCompare 13 vendors · 5 mg
Across all sizes, verified in-stock listings run $25.99 to $580.00 from 16 vendors.
VendorStock
09
Royal PeptidesUNTESTED · OUT
$9.00$45.00
10
Oasis LabsTRUST 5.7 · OUT
$9.40$47.00
12
Aavant ResearchTRUST 8.7 · OUT
$20.00$100.00
13
Genetic PeptideUNTESTED · OUT · 20% OFF
$24.80$124.00$155.00
Showing 8 of 13 vendors · 5 more from $9.00/mg
Retatrutide prices verified Oct 10, 2026
$5.20/mgModern Research · $25.99
Buy best priceSee how Retatrutide moved against the rest of the catalogue in the Peptide Price Index: median price per mg now versus 30 and 90 days ago, every tracked peptide, with a CSV.
Retatrutide price by vial size
| Vial size | Lowest per mg | Vial price | Vendor |
|---|---|---|---|
| 5 mg | $5.20 | $25.99 | Modern Research13 vendors carry it |
| 10 mg | $3.73 | $37.32 | Modern Research28 vendors carry it |
| 15 mg | $6.93 | $104.00 | Good Science10 vendors carry it |
| 20 mg | $3.07 | $61.32 | Modern Research21 vendors carry it |
| 30 mg | $2.89 | $86.65 | Modern Research20 vendors carry it |
| 50 mg | $3.07 | $153.32 | Modern Research8 vendors carry it |
| 100 mg | $2.20 | $219.99 | Modern Research3 vendors carry it |
| Other | $2.73 | $163.99 | Modern Research20 vendors carry it |
Verified 10 Oct 2026. Lowest figures are in-stock listings checked within the last week, with any coupon applied; a size with none says so.
Price movement · 30 days
−1.0%median per mg, all sizes
See our top-ranked Retatrutide vendors
Ranked by Finnrick trust score, independent lab testing, and price.
Compare Retatrutide head-to-head
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Quick Summary
An injectable agonist of the GLP-1, GIP and glucagon receptors, studied by Eli Lilly for obesity in the TRIUMPH Phase 3 program. No regulator has approved it. Available from 31 vendors, priced from $25.99 to $600.00.
Research: TRIUMPH-4 (NCT05931367) enrolled 445 adults who had both obesity and knee osteoarthritis. At 12 mg the efficacy estimand was 28.7% mean body weight reduction at 68 weeks and the treatment-regimen estimand was 23.7%. In the larger general-obesity trial TRIUMPH-1 (NCT05929066, n=2,339) the reported figures were 28.3% at 80 weeks and 30.3% at 104 weeks.
Side effects: In the 12 mg arm of TRIUMPH-4: nausea 43.2%, diarrhea 33.1%, constipation 25.0%, vomiting 20.9%, dysesthesia 20.9% against 0.7% on placebo, decreased appetite 18.2%
Phase 3Eli Lilly TRIUMPH program. Approved by no regulator and on neither the 503A nor the 503B bulks list; the FDA has issued warning letters to sellers. A BLA is planned for Q1 2027.
- 26 of 31 vendors currently have it in stock
- Highest-rated vendor: NUPEPS Peptides (9.0 Finnrick score)
- Most common vial size: 10mg
- Category: Weight Loss (GLP-1) — GLP-1 receptor agonists for weight management
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