In addition there is evidence that it protects the cardiovascular system, neuronal systems, the hepatobiliary system, the pulmonary system and the immune system
Its rare to have too much B12 in your blood
Low glutathione levels have been linked to abnormalities in the lungs' lining, and having normal glutathione levels may protect from inflammation by protecting lung tissue from free radical damage.27 Additionally, animal studies found that intravenous glutathione supplementation helped maintain normal lung function and prevent damage such as decreased lung compliance, increased swelling, and reduced lung tissue
For example, older people frequently have a problem with low acid levels in their stomachs
Cell Metab (2012) 15(4):4327
However, some humans may get pimples after taking glutathione supplements