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Vitamin B12 Why it matters: Found naturally in animal foods, vitamin B12 regulates key metabolic processes in the body both directly and as a cofactor (or "helper molecule") for two enzymes (methionine synthase and L-methylmalonyl-coenzyme A mutase)

In rare cases, users have reported increased energy levels or restlessness, which may be attributed to the compounds influence on systemic healing processes or neurotransmitter activity

2005 Nov;39(11):787-8

If you compare it to what we see with GLP-1/GIP therapy, the gap is obvious (more on that below)

When Panorama journalist Mark Daly relayed this information to Toni Minichiello, former coach of Jessica Ennis-Hill and a member of the UKA council, he said: Thats pretty damning