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is glutathione the body's primary antioxidant - an overview L-Glutathione vs. oxidized vs. Reduced
Description
A B12 injection is a clinical procedure: site rotation, clean technique and correct dosing matter, which is why a trained clinician is the safest place to have one

10.1038/s41598-020-77105-y 244 KnudsenJ

Elevated levels usually indicate pulmonary issues

The short answer is that glutathione is generally considered safe because it is a substance your body already produces and requires

Sexual dimorphism in autoimmune disease

And I think its also helping with mental clarity