Metabolic

Retatrutide

Also sold as LY3437943, Reta

Triple agonist (GLP-1, GIP, glucagon) and the most frequently tested peptide on the market this year. Prices vary widely between vendors, so purity and fill accuracy matter more here than anywhere else.

Vendors tested: 14; of 15 listed
Samples passed: 100%; of 16 results
Median price: $8.32/mg; 10 mg vials typical

Who leads Retatrutide

Vendors with independent results for Retatrutide, ordered by overall score. The pass counts and average purity shown are for this compound only, judged against 99.5% purity, confirmed identity, and fill within 25% of the label.

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1 Atomik Labz 2 of 2 passed, latest Oct 24, 2026, sold as Peptide 3 (R) Buy Peptide 3 (R) at atomiklabz.com 99.87% avg purity $9.90/mg $99 / 10 mg 94.9 Overall
2 Solution Peptides 2 of 2 passed, latest Sep 9, 2026, sold as Peptide 3 (R) Buy Peptide 3 (R) at solutionpeptides.net 99.81% avg purity $9.90/mg $99 / 10 mg 92.4 Overall
3 Crush Research 1 of 1 passed, latest Oct 9, 2026, sold as Triple Agonist 10mg Buy Triple Agonist 10mg at crushresearch.com 99.70% avg purity $4.90/mg $49 / 10 mg 90.4 Overall
4 Ion Peptides 1 of 1 passed, latest Oct 12, 2026, sold as ION-3R Buy ION-3R at ionpeptide.com 99.74% avg purity $5.85/mg $59 / 10 mg 89.9 Overall
5 ezPeps 1 of 1 passed, latest Oct 2, 2026, sold as GLP-3-RT Buy GLP-3-RT at ezpeps.com 99.76% avg purity $7.00/mg $70 / 10 mg 89.4 Overall
6 Peptide Partners 1 of 1 passed, latest Oct 20, 2026 Buy Retatrutide at peptide.partners 99.71% avg purity $5.17/mg $124 / 24 mg 87.9 Overall
7 Modern Aminos 1 of 1 passed, latest Jul 20, 2026, sold as MA-3RT Buy MA-3RT at modernaminos.com 99.77% avg purity $8.40/mg $84 / 10 mg 86.5 Overall
8 Simple Peptide 1 of 1 passed, latest May 27, 2026 99.68% avg purity n/a no listing 84.8 Overall
9 Peptidology 1 of 1 passed, latest Sep 12, 2026 99.72% avg purity n/a no listing 84.1 Overall
10 Peptide Maxxing 1 of 1 passed, latest Oct 15, 2026 99.73% avg purity n/a no listing 82.5 Overall
11 Skye Peptides 1 of 1 passed, latest Oct 6, 2026, sold as GLP-1 R (3RA) Buy GLP-1 R (3RA) at skyepeptides.com 99.78% avg purity $8.25/mg $99 / 12 mg 81.7 Overall
12 Southern Aminos 1 of 1 passed, latest Oct 1, 2026 99.65% avg purity n/a no listing 79.5 Overall
13 Particle Peptides 1 of 1 passed, latest Sep 29, 2026 99.63% avg purity n/a no listing 76.4 Overall
14 Polaris Peptides 1 of 1 passed, latest Oct 3, 2026 Buy Retatrutide at polarispeptides.com 99.60% avg purity $8.90/mg $89 / 10 mg 73.3 Overall

Listed, not yet tested

Penguin Peptides as GLP-3 R $11.8/mg