b12 injection Are Vitamin Shots Right for You? Cyanocobalamin (Vitamin B12) Injection is sold as an FDA approved generic drug Vitamin B12 Injections | B12

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With intramuscular injections of B12, any excess will result in high levels within your blood so you may experience side effects such as headache, dizziness, tiredness, or gastrointestinal issues including nausea, until your body has metabolised any excess through your kidneys enroute to excretion via urine

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Both injection types are far more effective at raising B12 levels than oral supplements, but the best method really depends on your individual needs