injection for deficiency of vitamin b12 A Vitamin B12 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 Injection – Manufacturer
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Chen AC, Martin AJ, Choy B, Fernndez-Peas P, Dalziell RA, McKenzie CA, et al

Is intramuscular (IM) administration of vitamin B12 injections preferred over subcutaneous (SC) administration?

In the UK, oral cyanocobalamin is the standard recommendation for dietary deficiency, whilst intramuscular hydroxocobalamin is preferred for pernicious anaemia or malabsorption

[1] Typical adult male replacement regimens involve intramuscular injections of 75 to 200 mg every one to two weeks, titrated according to trough serum testosterone, hematologic indices, and clinical response

Fatigue and lethargy Clinical trials recorded fatigue as an occasional adverse event

Administering a medication or biologics injection not classified as a vaccine
