how to draw up b12 injection self-inject intramuscular vitamin - Overview Loading a Syringe with Vitamin

Wighton MC, Manson JI, Speed I, et al

De Minicis, S

If you've had a BAD experience with B12 shots, it's most likely that you do not tolerate or convert cyanocobalamin well (see if you can verify what form of B12 was in the shot that made you react poorly, and then stay away from that specific form if you can)

With oral vitamins it can take days or weeks of daily dosing to build up the same effect

The combination of altered transit and potentially reduced acid creates conditions where B12 absorption efficiency could decline

These include the individual's current health status, metabolism, weight loss goals, and any underlying medical conditions