b12 injection reaction Adverse reactions to vitamin injections due... : Allergy bruising from b12 injection Vitamin
Description
Lifestyle and Preference: Consider your comfort level with needles and your ability to stick to a daily pill regimen

PLoS Med

After surgery, it is important to add them to your daily routine

The injection itself is usually hydroxocobalamin, which the UK prefers over cyanocobalamin because it stays in the body longer, as set out in the BNF entry
