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What the evidence does support is this: B12 deficiency causes fatigue and neurological symptoms, and correcting deficiency in people who are deficient improves those symptoms
Cell and Tissue Research , 377 (2), 153159
It is best to take a vitamin B12 test to determine if you have particular symptoms in the nervous system or have a vitamin b12 deficiency
Symptoms of a deficiency can be vague and include fatigue, weakness, a tingling sensation or numbness in your hands and feet, and memory problems
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