possible reasons for needing b12 injections What You Need to Know About Vitamin B12! Do you need these

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Kim et al

After it's released into your system, B12 combines with another molecule called the intrinsic factor that aids its absorption into the small intestine

Rare Stop receiving COBA FORTE 500MCG INJECTION and contact your doctor immediately if you experience any of the following side effects: Signs of severe allergic reactions such as wheezing, chest tightness, fever, itching, bad cough, blue/grey skin colour, seizures, swelling of the face, lips, tongue, or throat, and/or swelling/pain in the leg or arm

You should consult your GP for a formal diagnosis, which may require a different treatment plan as per NHS guidelines

Relationship between Serum Homocysteine Concentration and Dietary Factors in Young Japanese Women