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B12 injections are generally very safe with minimal side effects

The oxidized thiol proteome in aging and cataractous mouse and human lens revealed by ICAT labeling

Effect of oral N-acetylcysteine treatment on plasma inflammatory and oxidative stress markers in peritoneal dialysis patients: a placebo-controlled study

showed that Se boosted GPX1 expression by inhibiting DNMT2-mediated DNA methylation of the GPX1 promoter from lessening ROS production in advanced glycation end-product (AGE)-induced heart failure [114]

Yes, there are plenty of foods out there that you can consume that can help you improve the glutathione levels

Neurogenetics 5 , 135140 (2004)