b12 levels after injections When to recheck vitamin intramuscular vitamin B12 (cobalamin) injection? What Color is Vitamin B12

Strict vegans/vegetarians with low intake who prefer a rapid correctionthough high-dose oral B12 is usually effective (AAFP)

The injection site reactions deserve mention too

Many people notice an energy boost within a few days to a week, but it may take longer for other benefits to become apparent

While clinical interactions have not been documented, combining multiple compounds that affect similar pathways increases unpredictability

Also took away any cravings and it gives my really good energy

Great Ormond Street Hospital describes this area simply: underneath the outer skin sits a layer of fatty tissue, and that is where subcutaneous injections are given