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For patients diagnosed with a vitamin B12 deficiencyespecially when caused by problems with absorption in the digestive tract (such as pernicious anemia, certain gastrointestinal conditions, or after specific surgeries)oral supplements may not be effective

Plasma levels decline significantly: approximately 200 ng/ml at age 20, dropping to roughly 80 ng/ml by age 60

Neuroscience 48: 903914

While targeted enzymes can significantly reduce the symptom burden associated with eating, they do not address the root cause of the immune dysregulation or the viral persistence

However, more research is needed for definitive conclusions

Therefore, during oxidative stress, glutathione depletion enhances ascorbate synthesis to protect against oxidative damage [80]