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Required evidence may include clinical studies, extensive post-marketing use data, expert advice, and the views of relevant health professionals and public associations

People with certain conditions, like pernicious anaemia, digestive issues, or those who follow a strict vegan diet, often struggle to get enough

Bioavailability: 1 to 2% absorbed passively without intrinsic factor Deficiency: only if GI absorption is intact Dosing: daily, high-dose oral Prescription: no, available OTC At home: yes Get a B12 injection prescription Not sure which format fits your situation

Human evidence for precursors is mixed: some trials report good safety, but metabolic endpoints such as insulin sensitivity have not consistently replicated in people

PMC 6632124