glutathione breast cancer Treatment Resistance Mechanisms Revealed | Dr. Abhay Mishra posted on the topic What do cancer cells eat?

(2009) Pharmacological dose of vitamin B12 is as effective as low-dose folinic acid in correcting hyperhomocysteinemia of hemodialysis patients

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PMID 12654482

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doi: 10.3389/fneur.2019.01084

One reason for this is that the level of glutathione will fluctuate throughout the day from its lowest in the early morning to depletion from routine exposure to toxic substances (like alcohol), pathogens, cigarette smoke, car exhaust, drugs, certain foods, stress level, illness, and many similar factors, so repeated testing could be required to set a baseline