Retatrutide
The most talked-about weight-loss peptide in trials — it works on three pathways at once instead of one.
Best value right now · 5 mg
Modern Research
IN STOCKUNTESTED
Per mg63% under the $14.00 median
Vial price5 mg · verified Aug 21
Avg per mg · 5 mg
$18.56−9.6%
Ranged $17.79 – $20.53 across 40 vendorsCompare 16 vendors · 5 mg
VendorStock
13
Royal PeptidesUNTESTED · OUT
$11.00$55.00
14
Aavant ResearchTRUST 8.7 · OUT
$20.00$100.00
15
Genetic PeptideUNTESTED · OUT · 20% OFF
$24.80$124.00$155.00
16
Behemoth LabzUNTESTED · OUT
$29.52$147.58
Showing 8 of 16 vendors · 8 more from $11.00/mg
Retatrutide prices verified Aug 21, 2026
$5.20/mgModern Research · $25.99
Buy best pricePrice movement · 30 days
−9.6%median per mg, all sizes
Cheapest ever recorded: $0.916/mg on Aug 17. Today is 100.0% above that low.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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- Retatrutide vs 5-Amino-1MQ
- Retatrutide vs Mazdutide
Quick Summary
The most-hyped fat-loss peptide on the market right now — a next-gen injectable that hits three weight-loss pathways at once for potentially dramatic results. Available from 40 vendors, priced from $25.99 to $900.00.
Research: In the Phase 3 TRIUMPH-4 trial, participants lost an average of 28.7% body weight (~71 lbs) over 68 weeks — the highest weight loss ever reported for any obesity drug in a Phase 3 study.
Side effects: Nausea, Diarrhea, Constipation, Vomiting, Abnormal skin sensation
Phase 3Eli Lilly TRIUMPH program
- 33 of 40 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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