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Toxicol Lett (2000) 117(3):12937
The takeaway: oral glutathione supplementation can work, but form and delivery matter enormously
L-cysteine and NAC are generally well-tolerated, but possible side effects include: Nausea Vomiting Diarrhea Headache Abdominal pain Allergic reactions (rare) High doses may impact blood pressure or kidney function in sensitive individuals, so medical supervision is advised for long-term or high-dose use
others require injection
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