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Individual factors such as metabolic rate, body weight, and age may theoretically influence how B12 is distributed and utilised, though evidence for their impact on injection intervals is limited
Medical and Age-Related Absorption Issues Beyond what you eat, certain medical conditions can completely block your body's ability to absorb B12, no matter how much you get in your diet
According to USADA, the ban is in place partly because theres insufficient research on its safety and efficacy
When investigating elevated B12, additional tests such as active B12 (holotranscobalamin), methylmalonic acid, and homocysteine may help clarify true B12 status
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