injection reaction b12 Can Vitamin Injections Cause Nasty Rashes? Best Vitamin B12 Injection Site:
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They can cause side effects and, in some cases, allergic reactions

Deficiency may present as fatigue, neuropathy, cognitive changes, or gastrointestinal symptoms related to malabsorption
A systematic review concluded that it doesnt much matter how you get your vitamin B12, so long as you get enough ( Irish Journal of Medical Science , June 2024)

Some people may experience side effects from taking very high doses of vitamin B12 or receiving B12 injections above the vitamin B12 dosage recommendations