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can you feel tired after a b12 injection I All the Time. Do I Need Shot?: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 Injections for Energy,
Description
Common side effects include pain at the injection site, nausea, and dizziness

The answer depends on your individual needs

A 2013 study linked low vitamin B12 and folate levels with an increased risk of age-related macular degeneration ( Although the reduction in risk cant be attributed to vitamin B12 only, it does suggest that getting enough may be important

There are also foods fortified (supplemented) with B12 including breakfast cereals, nutritional yeast and infant formulas