administration of vitamin b12 injection How to self-inject intramuscular - Overview B12 Injection Dosage and Frequency:

As with many routine injections, the sensation is usually brief

has helped more than 30,000 patients regain their energy, improve metabolism, and balance their nutrition with medical B12 shots and wellness programs

1 2 Clinical hematology: theory and procedures (4th ed.)

Vitamin B12 does play a role in metabolism and energy production, but simply taking vitamin B12 injections is not likely to lead to significant weight loss on its own

Watch for worsening pain and spreading redness beyond the immediate area after 48 to 72 hours, fever, a hard warm lump, or systemic allergic symptoms such as hives, facial swelling, throat tightness, or breathing difficulty