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Understanding these reactions helps distinguish expected responses from those requiring medical attention
Vitamin B12 is key for the brain, healthy blood cells, and DNA

A Cochrane review comparing oral and intramuscular B12 found comparable effects on blood levels, and the same principle of good absorption applies to the subcutaneous route

However, there are differences in how each individual reacts to vitamin B12

Burton, B

[16] After this initial phase, the frequency is reduced
