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What Does It Really Mean to Have a ‘Normal B12 Level’?
Many B12 test results fall within the ‘normal’ range, yet fatigue, brain fog and
Written by: Pippa Thackeray
Updated: April 22, 2025
Written by: Pippa Thackeray | Updated: April 22, 2025
Quick Read
- Standard B12 test thresholds may be too broad, missing early signs of insufficiency.
- B12 levels between 200 and 300 ng/L may coincide with symptoms, even if considered 'normal'.
- Age, diet, medication, and digestive health influence B12 status.
- Functional markers like MMA, homocysteine, and HoloTranscobalamin offer a clearer view of B12 utilization.
- Vegans need to monitor B12 levels and supplement effectively due to its absence in plant-based foods.
Contents
- 1. The dangers associated with low B12
- 2. What is ‘normal’ B12 levels?
- 3. Functional practitioners and B12 thresholds
- 4. What influences your B12 status?
- 5. What to know about B12 testing
- 6. Why vegans need to watch their B12
- 7. 8 smart ways to support your B12 levels
