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The debilitating fatigue which seems to be the most common symtpom of B12 deficiency may be due to a combination of neurological factors, anaemia, and the role of B12 in the mitochondria

(181) established a high-iron diet mouse model, demonstrating that iron overload significantly increases iron levels in serum, colonic tissue, and feces, and successfully induces colitis phenotypes and ferroptosis

Is there evidence that a vitamin B12 injection can cause an acne breakout?

This results in neurological complications involving the spinal cord
