NAC helps to detoxify your body and neutralizes free radicals
Discover The Best NAC Supplement Uses & Benefits
Updated Mar. 18th, 2025 | Read Time: 2 Minutes | What You Will Learn:
- Key Health Benefits Of NAC
- Increasing NAC Through Diet & The Best NAC Supplement Options
- Potential Side Effects of NAC
- Nutritional Information
- Reader Comments (10)
N-acetyl cysteine (NAC) is a derivative of the amino acid L-cysteine and is a more stable form of this amino acid for supplementation. NAC is a precursor to the important antioxidant, glutathione. Glutathione works in the liver to change chemicals and metabolic byproducts into harmless substances for excretion from the body. NAC is also an antioxidant in its own right. It detoxifies heavy metals like mercury, cadmium, and lead. Let's explore the best NAC supplement options and how they can boost your health.
Key Health Benefits Of NAC
The best NAC supplement protects all cells of the body from damage due to aging, helps immune cells kill invading microbes (especially viruses) and stops cells from being harmed by radiation. Supplementation of NAC has also been shown to improve the body’s glutathione levels. NAC is recommended by natural health practitioners for conditions such as:
- Frequent colds and flu
- Asthma
- Bronchitis
- Acetaminophen toxicity
- Heavy metal toxicity
- Liver support
Increasing NAC Through Diet & The Best NAC Supplement Options
NAC is made by the human liver by altering the amino acid cysteine and can be found in high-protein foods, such as meat, fish, seafood, chicken or turkey. Minor sources are eggs, whole-grain products such as breads and cereals, and some plants including broccoli, onions, and legumes.
As a supplement, NAC is available as an encapsulated powder.
Potential Side Effects of NAC
Large NAC doses may cause diarrhea. NAC may inactivate some antibiotics and insulin.
People with bleeding disorders or taking blood thinning medications should not take NAC because it may slow blood clotting. NAC has an unpleasant smell that makes it hard to consume. If you choose to take it, consult your doctor first.
NAC keeps me from "coughing up a lung" in winter when the wood stove and furnace are on. The dry, sooty indoor air makes me cough like a smoker, my naturopath said to take NAC. It thins mucus to expel easier. I hardly cough anymore!!!!
Hello Marie,
Thank you for sharing how NAC has helped you. We're glad you enjoyed this article and that you've found natural relief.
Stay healthy & well.
This supplement works very well as a precursor to glutathione. Glutathione works in the liver to change chemicals and metabolic byproducts into harmless substances for excretion from the body. NAC is also an antioxidant in its own right. It detoxifies heavy metals and helps cleanse the body. Since taking this supplement I definitely have more energy and feel less biliary congestion, which is really nice. Overall I’m feeling good & looking forward to seeing how I feel after longer use.
Hello Judy,
Thank you for sharing your story with NAC, it is indeed a great supplement and glutathione is the master antioxidant for our bodies. If you'd like to learn more about glutathione, check out our other article here:
https://www.nationalnutrition.ca/articles/supplements/glutathione/
Stay healthy !
This is a product that I have started using the last few months. I helps with food digestion and strengthens body functions
Hello Sharon,
Thank you for sharing your experience with NAC, we're happy to hear it's been working well for your needs. If you're in need of new or more supplements to support digestion, have a look at this article of ours as well:
https://www.nationalnutrition.ca/articles/health-concerns/digestive-health/
Have a healthy day!
This is a product that I use daily to help digestion and strengthens immunity.
Hello, Sharon.
Thank you for sharing. If you'd like to learn about more supplements that support immune health, check out this article: https://www.nationalnutrition.ca/articles/health-concerns/digestive-health/
The concept of N-acetyl cysteine is really cool-I didn't know that there was a more stable form of cysteine! This is particularly interesting to me because several feloow lab members have experienced issues in their experimental assays due to lot variability/instability of cysteine. I wounder if using N-acetyl cysteine in certain experiments, such as those performed in mice, would be a solution to this issue. One question that I have about this article is if NAC is more easily converted to glutathione than is typical cysteine. Another question that I have is if NAC side effects are similar to side effects observed when taking high doses of cysteine seeing as it is a cysteine derivative or if they are different
Hello Rachel,
It is cool, and thank you for your comment and enjoying our article on NAC. Some side effects of NAC may include, nausea, vomiting, and diarrhea.
Happy learning