Metabolic

Tirzepatide

Also sold as Tirz

Dual GIP and GLP-1 receptor agonist. A long peptide that is expensive to make well, which is why underfilled vials are the usual way it fails.

Vendors tested: 12; of 16 listed
Samples passed: 92%; of 13 results
Median price: $7.25/mg; 10 mg vials typical

Who leads Tirzepatide

Ranked by pass score: the recency weighted share of each vendor’s Tirzepatide samples that met 99.5% purity, confirmed identity, and fill within 25% of the label.

Open with filters

1 Atomik Labz 2 of 2 passed, latest Oct 21, 2026 99.81% avg purity $5.80/mg $58 / 10 mg 97.2
2 Peptide Partners 1 of 1 passed, latest Sep 28, 2026 99.64% avg purity $6.80/mg $68 / 10 mg 96.2
3 Ion Peptides 1 of 1 passed, latest Sep 19, 2026 99.70% avg purity $6.90/mg $69 / 10 mg 96.1
4 Skye Peptides 1 of 1 passed, latest Sep 1, 2026 99.72% avg purity $7.10/mg $71 / 10 mg 96.0
5 ezPeps 1 of 1 passed, latest Aug 21, 2026 99.71% avg purity $6.60/mg $66 / 10 mg 96.0
6 Peptide Maxxing 1 of 1 passed, latest Sep 3, 2026 99.69% avg purity $6.40/mg $64 / 10 mg 96.0
7 Crush Research 1 of 1 passed, latest Aug 26, 2026 99.67% avg purity $8.30/mg $83 / 10 mg 96.0
8 Southern Aminos 1 of 1 passed, latest Aug 18, 2026 99.60% avg purity $7.10/mg $71 / 10 mg 95.9
9 Peptidology 1 of 1 passed, latest Aug 1, 2026 99.68% avg purity $9.00/mg $90 / 10 mg 95.8
10 Ascension Peptides 1 of 1 passed, latest Jul 8, 2026 99.69% avg purity $10.1/mg $101 / 10 mg 95.7
11 Modern Aminos 1 of 1 passed, latest Jun 5, 2026 99.70% avg purity $7.90/mg $79 / 10 mg 95.6
12 Polaris Peptides 0 of 1 passed, latest Aug 4, 2026 99.30% avg purity $6.70/mg $67 / 10 mg 51.9

Listed, not yet tested

Limitless Biotech $7.40/mg
Simple Peptide $7.60/mg
Core Peptides $8.20/mg
Biotech Peptides $8.60/mg