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You wont absorb all of it, but such a high B12 injection dose ensures you have enough B12 circulating in your bloodstream at all times
Some research advises those older than 50 years to meet their RDA mainly by consuming foods fortified with vitamin B12 or a vitamin B12-containing supplement
Many people will also experience cognitive difficulties such as problems with vision, memory, thinking, or reasoning, the development of mental illnesses such as depression, or general changes in behavior
These side effects are typically minor and short-lived
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