N-acetylcysteine (NAC) is a dietary supplement that is especially relevant in our modern world, and one that everyone can benefit from. There are decades of research on NAC’s positive effect on human health, ranging from lung and liver function, to supporting the body’s everyday detox functions, to metabolic and immune health. Its impact on immune function was spotlighted during the COVID pandemic, when research showed that it reduced symptom severity and mortality.¹ It’s even been shown to improve markers of aging.