why do you need to have b12 injections What Know About Vitamin Best Vitamin B12 Injection Sites:

This treatment is ideal as part of a wellness, weight loss, or energy-boosting protocol and can be administered once or multiple times per week based on your providers guidance

[DOI] [PMC free article] [PubMed] [Google Scholar] 215.Liu YL, Liang HR, Liu HT, et al

Make sure there is no air trapped inside and no blood when you pull on the syringe slightly

As to the aches and pains, breathlessness etc, this could be due to B12 needing potassium to build RBC, so I would check out low potassium symptoms and eat a banana or maybe two until you have fathomed it out

In short, management targets cause, not the B12 number alone

It is possible to inject subcutaneously into the fatty tissue of the abdomen, thigh, or upper arm