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The Advantages of B12 Injections for Athletes Superior Absorption While oral B12 supplements are available, injections offer a significant advantage in terms of absorption

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It doesn't create it from nothing

It is stored in the liver and whatever your body doesn't use is excreted through urine, Allen says

Vitamin E is essential for the conversion of non-active vitamin B12 into its active form

Claire warned: "You should see a GP as soon as possible if you think you may have a vitamin B12 deficiency for testing and if required treatment