glutathione makes me sleepy Effect of N-Acetylcysteine on Sleep: Impacts of Sex and Time of Day Mitochondrial Health and Fatigue: Restoring
Description
Because it delivers the fully formed, intact glutathione molecule directly to the cells, it does not require the body to synthesize it from precursors, and it does not trigger the histamine-liberating effects associated with NAC

Z.Abdel-NaimA

Addressing bottlenecks in large-scale production, targeted delivery, and in vivo stability will be crucial to translating these approaches into clinical practice
196204, Findeisen, Hannes M., et al

That divergence is exactly what makes them potentially complementary, not redundant
