Disclosure: We earn a commission from vendors on this page. Rankings are based on objective criteria including price, COA availability, and reputation.
Best Vitamin B12 Vendors of 2026
Ranked by Price, Purity, and Reputation
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Quick Comparison
| Rank | Vendor | COA | Score | Doses |
|---|---|---|---|---|
| 1 | Ion Peptide | Yes | 10/10 |
Other Ways to Buy Vitamin B12
Ready-to-use formats from the same vendors. These are priced per bottle rather than per vial, so they sit outside the cost-per-mg ranking above.
Drops & Oral Solutions
Sublingual dropper bottles and oral liquids, sold ready to use.
- Ion PeptideCOA15% off code thepeptidecatalogOut of stock10mg · $3.50/mgSold out$35.00
Vendor links are affiliate links — The Peptide Catalog may earn a commission at no additional cost to you.
Bulk Pricing
Per-vendor quantity breaks — pick a vial size to see the bulk price. Must purchase the full pack.
$7.50/mg $4.78/mg · 25% pack discount + 15% with code
Compare 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.