b12 injection cause diarrhea Compounded Methylcobalamin (Vitamin B12) Injection, 5mg/mL Are B12 Shots Safe? Royal
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Self-Administration Instructions for Home Use For those needing regular shots, doing them at home can be easier

The theoretical argument is simple: going sub q bypasses the gut and first-pass metabolism entirely, so in theory youd get close to 100% bioavailability versus the ~38% seen orally
This advice is also in line with best practice, where this approach is now becoming largely recommended
Those who follow a vegan or a plant-based diet are more likely to be deficient in vitamin b12
