when to check b12 level after injection Cobalamin (vitamin B12) and Folate Deficiency For those taking injectable B12,

It contains no preservative, so once you pierce the stopper, it's a race against contamination

It is closed with rubber stopper then an aluminum or plastic cap is placed to avoid contamination and making it tamper-proof

Injections raise blood levels quickly and are necessary for some medical conditions, but they are not a validated weight-loss therapy for healthy adults with normal B12 status

The Lancet HIV

However, if you have a "Slow COMT" mutation or a highly sensitive nervous system (common in MCAS and dysautonomia), taking methylated B12 can be disastrous

Your Symptoms Are The StoryListen Before It Gets Louder Subtle signs like mood swings, numbness, or insomnia can all stem from insufficient B12, even if you eat well