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Note: N-acetyl L-cysteine (NAC), as a precursor of glutathione, helps to replenish intracellular glutathione, a vital cellular antioxidant. NAC has a low molecular weight and is well absorbed via oral administration as compared to glutathione.

Endogenous Deficiency of Glutathione as the Most Likely Cause of Serious Manifestations and Death in COVID-19 Patients

Horowitz: Reducing inflammation can head off serious COVID complications

What is the role of supplementation with ascorbic acid, zinc, vitamin D, or N-acetylcysteine for prevention or treatment of COVID-19

Glutathione and COVID-19: Glutathione Deficiency Affects COVID-19 Susceptibility (Updated)

N-Acetylcysteine to Combat COVID-19: An Evidence Review

The Role of Glutathione in Protecting against the Severe Inflammatory Response Triggered by COVID-19