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The test then shows extremely high values beyond 1000 pg/ml of B12, although in reality there could well be an extreme vitamin B12 deficiency present (27-29)

There is no tolerable upper limit for vitamin B12

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Key Takeaways Vitamin B12 is an essential nutrient with nootropic (brain-related) benefits Optimal B12 supports cognition, brain energy, memory and mental clarity Maintaining good B12 levels may help with some mood and mental health concerns Restoring B12 may help manage stress-related fatigue and exhaustion B12 helps form myelin, the fatty sheathing that surrounds and protects neurons Many people fail to maintain healthy B12 levels, especially vegetarians and age 60+ Best Vitamin B12 form in supplements Look for cultured Vitamin B12 as NutriGenesis