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It does not matter for B12 injections, which bypass the digestion process and directly enter the bloodstream

There is nothing to detect

It exists in both oxidized (NAD + ) and reduced (NADH) forms, the latter is generated by NAD + accepting high-energy electrons from glycolytic and TCA intermediates and acts as a primary electron donor in ATP synthesis to drive mitochondrial OXPHOS 518

doi: 10.25259/GJMPBU_78_2023 [DOI] [Google Scholar] 315

The WADA Prohibited List is among those rules, as it outlines what substances and methods are prohibited in sport and at what times (at all times, in-competition only, or in certain sports)