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Third-party testing has found heavy metal contamination in commercially available vials

The interesting thing is that our body can store vitamin B12 in the liver for a long time, so it might take a few years before you start to have a shortage of it in your body

[DOI] [PubMed] [Google Scholar] 43.Mankertz J, Amasheh M, Krug SM, et al
WADA continues to implement regulatory updates, athlete education resources, Therapeutic Use Exemption programs, and whereabouts monitoring to preserve the integrity of athletics