vitamin b12
8 certified brands.
Grouped into tiers by the number of independent third-party certifications each brand holds (more bodies = higher tier). Within a tier, brands are ordered by how many of their products are certified, then by how recently each was verified, then Labdoor letter grade breaks remaining ties. This reflects only how thoroughly each brand is independently verified — not product quality, efficacy, or price, and not an endorsement.
Verified by 2 independent bodies
Most independently tested| Brand | Certifications | Products | Verified | Shop |
|---|---|---|---|---|
| Thorne | NSF_DIETARY NSF_SPORT | 1 | — | Shop:AmazoniHerbFullscript |
Verified by 1 independent body
| Brand | Certifications | Products | Verified | Shop |
|---|---|---|---|---|
| International Vitamin Corporation | NSF_DIETARY | 7 | — | Shop:AmazoniHerbFullscript |
| Farmacias de Similares TX LLC | NSF_DIETARY | 1 | — | Shop:AmazoniHerbFullscript |
| Healthspan Elite | INFORMED | 1 | — | Shop:AmazoniHerbFullscript |
| Heartwise Incorporated | NSF_DIETARY | 1 | — | Shop:AmazoniHerbFullscript |
| Nature Made | USP | 1 | — | Shop:AmazoniHerbFullscript |
| SCN Bestco | NSF_DIETARY | 1 | — | Shop:AmazoniHerbFullscript |
| Wegmans | NSF_DIETARY | 1 | — | Shop:AmazoniHerbFullscript |