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red blood cells b12 injections Vitamin A Vitamin B12 injection is a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps Vitamin B12 Injections: Hot Shots?
Description
The injection should be given in the middle third of both axes

doi: 10.1177/0883073815583688
While an advanced technique, it can further enhance the longevity of reconstituted solutions during 5-Amino-1MQ storage

Conclusion B12 deficiency is a common diagnosis in clinical practice
Sequential treatment is simpler and may avoid supplement interactions

It also depends on how deficient you are already