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doi: 10.1007/s00018-003-3325-z 69 Vivas-RuizDESandovalGAMendozaJIngaRRGontijoSRichardsonMet al

Newman B, Gu X, Wintle R, et al

Which type(s) of B12 does this supplement contain, Methylcobalamin or Cyanocobalamin

doi: 10.1111/j.1939-1676.2009.0308.x

doi: 10.1016/j.bbcan.2018.06.005
These issues might explain why some studies find no change in blood glutathione levels with supplementation
