Disclosure: We earn a commission from vendors on this page. Rankings are based on objective criteria including price, COA availability, and reputation.
Best Semaglutide Vendors of 2026
Ranked by Price, Purity, and Reputation
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Quick Comparison
1Ascension PeptidesCOA
10/105mg$8.00/mg
2Ion PeptideCOA
9.7/1020mg$3.45/mg
3EZ PeptidesCOA
9.3/10$4.80/mg
4Glacier AminosCOA
9/1015mg$4.80/mg
| Rank | Vendor | COA | Score | Doses |
|---|---|---|---|---|
| 1 | Ascension Peptides | Yes | 10/10 | |
| 2 | Ion Peptide | Yes | 9.7/10 | |
| 3 | EZ Peptides | Yes | 9.3/10 | |
| 4 | Glacier Aminos | 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 $2.20/mg$517.5020mg × 10$2.59/mg → $2.20/mg with code
View at Ion PeptideGlacier AminosCOA10% code thepeptidecatalog
as low as $3.02/mg$647.9015mg × 10$4.32/mg → $3.89/mg with code
View at Glacier AminosEZ PeptidesCOA10% code thepeptidecatalog
as low as $3.31/mg$368.0010mg × 10$3.68/mg → $3.31/mg with code
View at EZ PeptidesAscension PeptidesCOA
as low as $3.60/mg$360.005mg × 10$7.20/mg → $3.60/mg auto-applied
View at Ascension PeptidesCompare 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.