If you are over 50, take metformin or acid-blocking medication, eat little or no animal food, have tingling in hands or feet, brain fog, low mood, balance changes, or a rising MCV on your CBC; B12 deserves a functional look, not just a serum number.
Serum B12 can look “fine” while methylmalonic acid (MMA) is already climbing — a sign your cells are not actually using B12 well. That gap is where people get told they are fine and still feel anything but. B12 is essential for nerve insulation, red-cell quality, methylation, and energy metabolism. Absorption depends on stomach acid and intrinsic factor, both of which decline with age and with common prescriptions.
I prefer methylcobalamin or hydroxocobalamin in most cases, and I respect that some people need injections when the gut is not a reliable doorway. “Normal B12, abnormal you” is one of the most common mismatches.
When was your B12 last checked? Did anyone also look at MMA or homocysteine? If you take metformin or a PPI, put B12 on the monitoring list. It is not optional.
#VitaminB12 #BrainFog #Energy #Methylation #FunctionalMedicine
