b12 injection complications Vitamin Side Effects Vitamin B12 Side Effects: Risks
Description
B12 is a water-soluble vitamin, meaning your body will naturally excrete any excess

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Vitamin B 12 is needed to produce an adequate amount of healthy red blood cells in the bone marrow

"Vitamin B12 in Health and Disease"

Adverse reactions following intramuscular (IM) injection have included anxiety, mild transient diarrhea, ataxia, nervousness, pruritus, transitory exanthema, and a feeling of swelling of the entire body
Athletes with optimal B12 status wont feel a surge from injections because their systems already operate normally