how many weeks of b12 injections to resolve anemia Vitamin Injection Dosage Oral vs. Intramuscular Vitamin B12
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BMJ 366

No, diarrhoea is an uncommon side effect of vitamin B12 supplementation

As the NHS explains, you should see a GP if you're experiencing symptoms of vitamin B12 because these conditions can often be diagnosed based on your symptoms and the results of a blood test

The main symptoms to note are constantly feeling sluggish, weakness, trouble losing weight, numbness, along with other signs
