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Deficiency can also be caused by poor absorption

Samir Sinha, who was not involved in the research, said B12 shots can't provide "a big boost." "Getting B12 shouldn't instantly make you feel great or more powerful," he said

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Serum and red blood cell folate testing for folate deficiency: New features

Metabolism Boost Vitamin B12 plays a crucial role in your body's metabolism

It also plays a role in the formation of red blood cells, which are necessary for transporting oxygen throughout the body