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How Long Do the Benefits of a B12 Shot Last

Some patients report feeling refreshed or more energized after a B12 shot, while others may notice changes gradually over time

Doctors typically use B12 shots to treat vitamin B12 deficiency

Management approaches include increasing fiber intake gradually (too much fiber at once worsens bloating), drinking at least 64 ounces of water daily, taking magnesium citrate (400-600mg at bedtime), and increasing physical activity

Vitamin B12 is a water-soluble vitamin that acts as a cofactor for methionine synthase and methylmalonyl-CoA mutase, supporting nerve function, red blood cell production, and DNA synthesis