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Vitamin B12
What it helps
A shortage shows up in the fastest-dividing and longest-reaching tissues first. Those are the places refilling it changes.
Sources
Read the original sources
- NIH: Vitamin B12 fact sheet (NIH Office of Dietary Supplements · Official nutrient fact sheet · checked 2026-10-08)
- Clinical practice: vitamin B12 deficiency (Summary · checked 2026-10-13)