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The effects of a vitamin B12 shot can last anywhere from a few days to a few weeks , depending on your bodys needs and current B12 levels
Can vitamin B12 deficiency go away on its own
However, because B12 plays a role in metabolism (converting fats and carbohydrates into energy), ensuring adequate levels can support your bodys efficiency and provide an energy boost that makes maintaining a healthy diet and consistent exercise routine easier
Results were mixed some studies showed modest weight loss, others were less compelling
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