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: 13; of 17 listed
Samples passed: 100%; of 14 results
Median price: $9.50/mg; 10 mg vials typical

Who leads Retatrutide

Ranked by pass score: the recency weighted share of each vendor’s Retatrutide samples that met 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 99.87% avg purity $7.40/mg $74 / 10 mg 100.0
2 Skye Peptides 1 of 1 passed, latest Oct 6, 2026 99.78% avg purity $9.00/mg $90 / 10 mg 100.0
3 Modern Aminos 1 of 1 passed, latest Jul 20, 2026 99.77% avg purity $9.90/mg $99 / 10 mg 100.0
4 ezPeps 1 of 1 passed, latest Oct 2, 2026 99.76% avg purity $8.40/mg $84 / 10 mg 100.0
5 Ion Peptides 1 of 1 passed, latest Oct 12, 2026 99.74% avg purity $8.70/mg $87 / 10 mg 100.0
6 Peptide Maxxing 1 of 1 passed, latest Oct 15, 2026 99.73% avg purity $8.10/mg $81 / 10 mg 100.0
7 Peptidology 1 of 1 passed, latest Sep 12, 2026 99.72% avg purity $11.4/mg $114 / 10 mg 100.0
8 Peptide Partners 1 of 1 passed, latest Oct 20, 2026 99.71% avg purity $8.60/mg $86 / 10 mg 100.0
9 Crush Research 1 of 1 passed, latest Oct 9, 2026 99.70% avg purity $10.4/mg $104 / 10 mg 100.0
10 Simple Peptide 1 of 1 passed, latest May 27, 2026 99.68% avg purity $9.50/mg $95 / 10 mg 100.0
11 Southern Aminos 1 of 1 passed, latest Oct 1, 2026 99.65% avg purity $9.00/mg $90 / 10 mg 100.0
12 Particle Peptides 1 of 1 passed, latest Sep 29, 2026 99.63% avg purity $9.50/mg $95 / 10 mg 100.0
13 Polaris Peptides 1 of 1 passed, latest Oct 3, 2026 99.60% avg purity $8.50/mg $85 / 10 mg 100.0

Listed, not yet tested

Limitless Biotech $9.60/mg
Core Peptides $10.5/mg
Biotech Peptides $10.9/mg
Ascension Peptides $12.8/mg