how to increase glutathione in body levels: 4 natural ways How To Increase Glutathione Naturally
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10.1074/jbc.271.20.12063 32 LeeW

Special attention is given to the role of metformin, the first-line therapy for T2DM, in precipitating or exacerbating vitamin B12 deficiency through mechanisms involving alterations in the gut microbiota and intestinal absorption

doi: 10.1021/acsami.1c04638 166 LiCXZhangYDongXZhangLLiuMDLiBet al

The reasons for the halted development are not entirely clear, but likely relate to commercial and regulatory factors rather than safety concerns
