are vitamin b12 injections good for you How to Boost Immune System with Why B12 Shots Are Popular
Description
It is not appropriate during pregnancy or breastfeeding, in active cancer, or in patients with severely uncontrolled metabolic disease without specialist coordination

doi: 10.1073/pnas.0308698100

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Vitamin B12 is a water-soluble vitamin which means any excess will be urinated out of your body (assuming you have normal kidney function), so the risk of overdose is basically non-existent
