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Vitamin B12 plays a vital role in various physiological processes, including energy production, metabolism, blood cell formation, and nerve function
Healthline notes that another side effect of too much vitamin B12 is the development of a rare and slow-growing blood cancer known as "polycythemia vera" (PV)
When it is deficient, it can cause folic acid deficiency, which can lead to DNA synthesis obstacles and affect the development and maturation of red blood cells
Here is what the evidence says, clearly and without exaggeration
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