PLoS ONE, 5 (1), e8976
Track your symptoms and lifestyle for a few weeks
Immediately following the injections, you may experience: Minor redness generally lasts no longer than 1 hour, and for most patients, this dissipates before they leave the office (15 minutes) Swelling generally increases for the first 24 hours, before resolving within 48-72 hours
The application of NICE guidelines outside of England varies: Scotland, Wales, and Northern Ireland: These parts of the UK have their own guideline development bodies (SIGN, TGCS, and BSG, respectively)
The superior rate of absorption of B12 injections means that they can be administered every 3-6 months
Keep an eye out for these tell-tale signs of trouble: Cloudy or Hazy Appearance: If the solution looks milky and doesn't clear up after a reasonable amount of time, you likely have a solubility or aggregation problem