is biologically active glutathione oxidized or reduced Difference Between and Glutathione Glutathione-Related Enzymes and Proteins: A

HepG2-based reporter cells were generated by Bacterial Artificial Chromosome tagging as described previously (Poser et al., 2008) and have been characterized previously (Wink et al., 2017)

Data availability All data produced in this study can be made available from the corresponding author upon a reasonable request

[DOI] [PMC free article] [PubMed] [Google Scholar] 156.Zhang C., Liu X., Jin S., Chen Y., Guo R

Serum Vitamin B12 levels and methylmalonic acid (MMA) tests help confirm the deficiency

doi: 10.1007/s00125-015-3705-6

This means B12 deficiency is real and underdiagnosed, but it is not universal and not everyone experiencing fatigue has a B12 problem