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[26] [27] If you believe you've experienced side effects from vitamin B12 supplementation, you can report this through the MHRA Yellow Card Scheme (yellowcard

Two, people with genuine B12 deficiency are, after withdrawal, at risk of developing worse symptoms, which may even persist after resuming treatment

There is a synthetic version which doctors can prescribe, but which can cause liver damage, serious psychiatric effects and heart and respiratory problems if taken without medical oversight

Certain people are more at risk of vitamin B12 deficiency than others, especially those who have low stomach acid or other digestive issues