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NAC
Also called: N-acetylcysteine, N-acetyl-L-cysteine
A form of the amino acid cysteine that your body uses to make glutathione, a key antioxidant. It also helps thin mucus.
Commonly used for
- Glutathione and antioxidant support
- Liver support
- Thinning mucus in the airways
- PCOS (some studies)
- Compulsive habits like hair pulling or skin picking (mixed evidence)
Found naturally in
- Not found in food as NAC
- Your body makes cysteine from protein
- Chicken, turkey, and eggs
- Yogurt
- Legumes
Label red flags
- Capsules that are clumped, sticky, or discolored, since NAC breaks down with moisture
- Proprietary blends that hide how much NAC is in the product
Check with a provider
- Taking nitroglycerin or other nitrates. NAC can increase headaches and low blood pressure.
- Asthma, since NAC has caused airway tightening in some people
- Bleeding disorders, taking blood thinners, or having surgery soon
- Pregnancy or breastfeeding
- A sulfur smell is normal. Stomach upset or nausea is the most common side effect.
Supplements that contain it
Brand nameProduct nameLiver and detox formulasComing soon
Brand nameProduct nameRespiratory support formulasComing soon
Brand nameProduct nameAntioxidant blendsComing soon
Brand nameProduct namePCOS formulasComing soon
Brand nameProduct nameLiver and detox formulasComing soon
Brand nameProduct nameRespiratory support formulasComing soon
Parts of the body it affects
Explore what each area does and the conditions that can affect it.
Lungs
Your lungs bring oxygen in and carry carbon dioxide out. Several autoimmune conditions can inflame or scar lung tissue, often quietly at first.
Liver
Your liver filters your blood, processes hormones and medicines, and makes bile to digest fat.
Illustrations: Servier Medical Art, CC BY 4.0
Wondering if your symptoms fit a pattern?
Dr. Lesher is a naturopathic doctor who specializes in women's autoimmune and chronic conditions. Since 2020, she has helped more than 900 patients overcome and heal from their conditions.