can b12 injections cause diarrhea Vitamin B12: Symptoms, Dosage & Toxicity Risks Vitamin B12 Deficiency Anemia: Symptoms,

If youre unsure, a quick refresher on injection techniques can be a big help

Data last updated 07/07/2026

If you experience any adverse effects or have concerns, seek advice from a healthcare provider

Animal foods particularly high in vitamin B12 include bluefin tuna, Pacific oysters, salmon, Atlantic herring, mackerel, sardines, trout, and tuna

Its important to attend all scheduled injections because skipping doses could allow B levels to fall again

See the image for the exact spot The name for injections in this area are called intramuscular because the needle must penetrate the muscle to deliver your vitamin B-12 so that it is quickly delivered where your body needs it