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Vitamin B12 include poultry, fish, potatoes, chickpeas, bananas and fortified breakfast cereals

Key Takeaways Serum B12 alone misses up to 50% of functionally deficient patients always add MMA for confirmation The optimal longevity range for serum B12 is 500900 pg/mL, far above the standard lab cutoff of 200 pg/mL B12 deficiency progresses through four stages, from depleted stores to irreversible neurological damage Methylcobalamin is the preferred supplementation form for most people

The first stage is perimenopause, which can begin as early as a woman's 30s or up to her late 40s

For individuals with atrophic gastritis, pernicious anaemia, or those taking proton pump inhibitors , food-bound B12 absorption is already compromised