Over the last few years there has been an increasing level of interest in supplements promoting overall better health and NAC has been the leading supplement in this movement. N-acetyl cysteine (NAC) is a supplement derived from the amino acid L-cysteine, which is a precursor to glutathione, a critical antioxidant in the body. NAC is well-regarded for its role in replenishing glutathione levels and helping to manage oxidative stress, a process linked to several health conditions. By boosting glutathione, NAC assists in the neutralization of free radicals and toxic substances, thus protecting cells from damage. This function is especially vital in the liver, where detoxification primarily occurs. Additionally, NAC can modulate the levels of neurotransmitters, potentially impacting conditions influenced by neurotransmitter imbalances, such as addiction or compulsive behaviors. Lastly, it also acts as a mucolytic agent, breaking down mucus in the airways and thereby aiding individuals with chronic respiratory conditions such as COPD.