Disclosure: We earn a commission from vendors on this page. Rankings are based on objective criteria including price, COA availability, and reputation.
Best Tirzepatide Vendors of 2026
Ranked by Price, Purity, and Reputation
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Quick Comparison
1Ion PeptideCOA
10/10$3.62/mg
2Ascension PeptidesCOA
9.8/10$3.67/mg
3EZ PeptidesCOA
9.5/10$3.27/mg
4Glacier AminosCOA
9.3/10$3.27/mg
5Nura PeptidePREMIUMCOA
9/10$5.67/mg
| Rank | Vendor | COA | Score | Doses |
|---|---|---|---|---|
| 1 | Ion Peptide | Yes | 10/10 | |
| 2 | Ascension Peptides | Yes | 9.8/10 | |
| 3 | EZ Peptides | Yes | 9.5/10 | |
| 4 | Glacier Aminos | Yes | 9.3/10 | |
| 5 | Nura PeptidePREMIUM | Yes | 9/10 |
Bulk Pricing
Per-vendor quantity breaks — pick a vial size to see the bulk price. Must purchase the full pack.
Ion PeptideCOA15% code thepeptidecatalog
as low as $1.27/mg$1492.50100mg × 10$1.49/mg → $1.27/mg with code
View at Ion PeptideEZ PeptidesCOA10% code thepeptidecatalog
as low as $1.33/mg$888.0060mg × 10$1.48/mg → $1.33/mg with code
View at EZ PeptidesAscension PeptidesCOA
as low as $1.65/mg$990.0030mg × 10$3.30/mg → $1.65/mg auto-applied
View at Ascension PeptidesGlacier AminosCOA10% code thepeptidecatalog
as low as $1.73/mg$1484.9060mg × 10$2.47/mg → $2.23/mg with code
View at Glacier AminosNura PeptideCOA25% code thepeptidecatalog
as low as $2.81/mg$2250.0060mg × 10$3.75/mg → $2.81/mg with code
View at Nura PeptideCompare More Peptide Vendors
How We Score Vendors
Our scoring is based on three weighted factors:
Price Competitiveness (40%)
Normalized to cost per milligram for fair comparisons across vial sizes.
COA Availability (30%)
Third-party lab testing confirming purity, identity, and absence of contaminants.
Vendor Reputation (30%)
Community feedback, shipping reliability, customer service, and business track record.