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The vitamin B12 in your body, also called cobalamin, plays an important role in energy production, brain function, and red blood cell production

This brings us to the concept of bioavailability the proportion of a substance that enters the circulation when introduced into the body and is so able to have an active effect

10.1007/s11033-011-0749-7 171 WeiL.JianH.LuK.FilardoF.YinN.LiuL.et al

It also depends on how the numbers are measuredclinical trials report weight loss using different estimands (essentially, different ways of calculating average results), which is why youll sometimes see slightly different percentages for the same study