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Data collected in laboratory settings by Khorram et al

The confusion likely stems from two sources: unrelated concerns about high-dose intravenous glutathione injection practices used in some cosmetic clinics (a different delivery method with a different risk profile), and complex ongoing research into glutathione's role within existing cancer cells which is a completely separate scientific question from whether a healthy person taking an oral supplement faces increased cancer risk

Journal of Biological Chemistry , 288 (12), 86108618

By staying in the middle zone and targeting the outer surface, you minimize the chance of encountering significant blood vessels