The American Institute of Medicine, Food and Nutrition Board, and the European Scientific Committee on Food, both decided not to set an upper B12 intake limit, because toxicity from overdosing on B12 poses no risk
doi: 10.1074/JBC.M000604200 103 MahutBDelclauxCTillie-LeblondIGossetPDelacourtCZerah-LancnerFet al
This liver-protective role is why glutathione IV therapy has been used clinically for decades before becoming a mainstream wellness treatment
Without enough vitamin B12, red blood cell production may be impaired, leading to fatigue and decreased energy levels
These methods are not evaluated in the review itself, but they represent a growing interest in how glutathione can be supported beyond lifestyle and precursors
Excessive alcohol consumption can also interfere with the bodys absorption of B12