does oral b12 work as well as injections Injection vs. Supplements: Which One Do You Actually Need? – ELLEMES Medical Spa Vitamin B12 Injections and Weight

Passive diffusion accounts for 1.2% of overall absorption, with little effect on bioavailability in patients with pernicious anemia or gastro-duodenal resection [49, 50]

For example the use of vitamin B12 for correct reasons improved by 10% (62% in phase 1 to 72% In phase 2) resulting in a 32% reduction in the number of patients inappropriately receiving it (521 to 352)

If you're tired after B12 shot or experiencing worsening symptoms, there are several steps you can take to mitigate these effects and optimize the benefits of B12 supplementation

My body feels better after I take it and I have notices a decline in hunger