glutathione have side effects 7 Surprising Supplement Glutathione Injections for Skin Whitening:

2024 Apr 29;23(1):86

doi: 10.1093/infdis/jir458 137 RussellC

The right dose and schedule depend on age, weight, and how severe the deficiency is

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These conditions digestive conditions, such as Crohns disease and ulcerative colitis autoimmune conditions, such as celiac disease and type 1 diabetes genetic conditions, such as inherited intrinsic factor deficiency and inherited transcobalamin deficiency chronic pancreatic disease pernicious anemia vitiligo Other factors that may lead to a vitamin B12 deficiency can include drinking excessive amounts of alcohol or using certain drugs, such as some heartburn medicines and metformin