Understanding Vitamin B12 Deficiency: Causes and Symptoms Common Causes of B12 Deficiency Poor dietary intake (common in vegans and vegetarians)
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Its deficiency can cause neurodevelopmental problems, which can be partly reversible with early treatment
These can lead to side effects or reactions that you may then associate with the B12 itself, even though B12 has nothing to do with them
Overgrowth of bacteria: Some people develop vitamin B 12 deficiency as a result of conditions that slow the movement of food through the intestines (diabetes, scleroderma, strictures, diverticula), allowing intestinal bacteria to multiply and overgrow in the upper part of the small intestine
Interestingly, hydroxocobalamin is even used to detoxify cyanide