pernicious anemia requires vitamin b12 injections for effective therapy. Anemia: Causes, Symptoms, Diagnosis, and Treatment Cost of Vitamin B12 Near
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Retrieved 25 February 2022

There are no harmful Phentermine interactions with vitamin B12

Serious Vitamin B12 deficiency may result in anemia, stomach problems, and possible nerve damage

Vitamin B-Complex 100 Injection [Prescribing information]

If you have a diagnosed deficiency, follow your doctors advice
