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b12 injection while fasting Shots Benefits & How to Use Them For Weight Loss B12 Shots Dosage for Adults:
Description
[1] This is to reduce the risk of hypotension or vein irritation

Phys Ther 94(9):13271336

Only an estimated 1%2% of oral B12 can be passively absorbed and therefore, high dosages of oral B12 are required to provide therapeutic benefit in cases where the receptor-mediated process malfunctions (Withey et al., 1963)

But if your flu vaccine reaction results in prolonged pain, limited mobility, or severe complications, it may be more than just a routine side effect
