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doi: 10.2147/IJN.S30463 14

Intravenous reduced GSH supplementation reverses endothelial dysfunction in patients with atherosclerosis enhancing NO activity and NO-mediated vasodilation (218)

Although there is no official guidance on recommended dosing, most research suggests daily doses of 10 mg of lutein and 2 mg of zeaxanthin may be associated with positive health outcomes

Still it is required

Safety and tolerability: Who should exercise caution with glutathione If you are pregnant, breastfeeding, or undergoing chemotherapy, you should definitely consult your doctor before taking glutathione

Typical real world usage sits around 0.5-5% (and 1-2% is common for daily serums)