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A study in European Journal of Nutrition (2015) did find that long-term supplementation with 1,000mg oral glutathione could raise blood glutathione levels but it required 6 months and significantly higher doses compared to NAC

Antioxidant drugs may be effective in treating these conditions

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Figure 4 Figure 5 Figure 6 Figure 7 Discussion Our results showed that GSH and SA may induce partially overlapping signaling pathways in tobacco to confer resistance to TMV

This article compares the three from a research perspective

Understanding the regulatory landscape helps clarify what's legal, what's not, and why sourcing matters