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Many people report feeling more energetic within a few days, while others notice gradual improvement over one to two weeks
Some patients are trained to self-inject after the first few doses at the clinic
Broadly speaking, B12 injections give the body further resources to produce more red blood cells to carry larger amounts of oxygen throughout the body, meaning those who receive such treatments can benefit from increased energy and reduced feelings of fatigue
Shots are injected directly into the muscle (usually the glutes or upper arm) and are quick and relatively painless
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