Natural Factors N-Acetyl-L-Cysteine (NAC) is a free-form amino acid and a vital part of the body’s antioxidant defence system. It is needed to produce glutathione, a key antioxidant involved in many physiological processes, such as fighting oxidative stress, maintaining a healthy immune system, repairing tissues, cellular detoxification, and supporting overall health. NAC supplementation has been clinically shown to increase the body’s antioxidant capacity and help reduce the severity and frequency of influenza-like symptoms in adults over 65. NAC is also the most stable and readily absorbed form of cysteine.
As a free-form amino acid, cysteine is one step closer to producing glutathione than when it is consumed as part of a complete protein from food. Oral supplementation with NAC also increases glutathione levels more effectively than supplementing with glutathione itself. This is because glutathione breaks down in the gastrointestinal tract, whereas NAC does not. It passes into the bloodstream intact.
NAC is an ideal nutritional supplement for adults who want to improve their immune system health. NAC is an effective option for anyone with high levels of oxidative stress or depleted glutathione stores.


Scavenges free radicals and reduces oxidative stress
Replenishes depleted glutathione stores
Aids respiratory health
Reduces the frequency of flu-like symptoms in adults over 65
Helps relieve symptoms of chronic bronchitis