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Description
This review synthesizes evidence from over 15 peer-reviewed publications (20202026), prioritizing systematic reviews, meta-analyses, and phase 3/4 clinical trials extracted from PubMed

For example, one study found that after taking 1,000 mcg of oral vitamin B12, only about 1.3% (13 mcg) is absorbed into the bloodstream

doi: 10.1124/jpet.102.047712

Every lot ships with a third-party Certificate of Analysis.
