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If the patient is suspected to be sensitive to cobalt or other components of cobalamin, an intradermal test dose is recommended.[12][15] Several laboratory tests should be performed prior to treatment with cyanocobalamin, including serum vitamin B12, folate, iron, hematocrit, and reticulocyte count

Better Mood & Focus : Helps reduce feelings of fatigue and brain fog

Key Takeaways Metformin can interfere with vitamin B12 absorption, leading to deficiency in up to 41% of long-term users

Weight loss and metabolism Some studies suggest that higher vitamin B12 levels may protect against obesity or being overweight

B12 and the Brain A vitamin B12 deficiency is typically one of the first things checked in someone who is experiencing unexplained cognitive impairment, Yourman says, since not getting enough of the essential vitamin can cause memory problems and confusion