do vitamin b12 injections give you energy Injections: What Need To Know Can Vitamin B12 Really Boost

Certain groups, including vegetarians, vegans, and older adults, are at higher risk for B12 deficiency and should consider supplements or fortified foods

Mild nausea or a temporary drop in blood pressure

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If the cause is absorption failure (pernicious anemia, gastric surgery), intramuscular B12 injections bypass the gut