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It is also banned by the World Anti-Doping Agency, meaning competitive athletes cannot use it without risking a positive drug test and sanctions

This is why sourcing diligence and independent verification matter for research-grade material

A few rules that apply across all use cases: Consistency matters more than dose size

Vitamin B12 Medicine Interactions Chloramphenicol: bacteriostatic antibiotic can interfere with red blood cell response to supplemental Vit B12 Proton pump inhibitors: omeprazole and lansoprazole, etc., slow gastric acid release and may interfere with VIt B12 absorption from food H2-receptor antagonists: cimetidine, famotidine and ranitidine slow the release of hydrochloric acid into the stomach and interfere with Vitamin B12 absorption from food Metformin: might reduce absorption of Vitamin B12 due to altered intestinal motility, increased bacterial overgrowth, etc

Lean subjects: low NNMT activity in adipose tissue