AMINO ACIDS
NAC (N-acetyl-L-cysteine)
NAC (N-acetyl cysteine) helps the body make glutathione and supports respiratory and liver health.
Also known as: N-acetyl cysteine, N-acetyl-L-cysteine, acetylcysteine
At a glance
- Form
- N-acetyl-L-cysteine
- Category
- Amino Acids
- In an apiece formula
- 600 mg a day (you can change it)
- Recommended intake
- No recommended intake (not an essential nutrient)
- Upper limit
- No established UL
- Studied for
- Immune support, Healthy aging*
- Reference
- NIH ODS: Dietary Supplements, What You Need to Know
What the research says
In pooled trials, NAC raised glutathione, the body's main antioxidant, and reduced soreness after exercise.*
systematic review and meta-analysis · 20 studies · Sadowski M, J Cell Mol Med 2024. Read the study on PubMed
Who should be careful
Our safety rules leave NAC out of a formula, or keep the amount lower, with:
Medicines and supplements
- Nitrate
- Chemotherapy or targeted cancer pills
- Radiation therapy
- Cancer immunotherapy
Life stage
- Pregnancy
- Breastfeeding
- Trying to conceive
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Symptoms it’s studied for
Questions
How much NAC a day?
apiece formulas usually include 600 mg a day. The recommended intake for adults is No recommended intake (not an essential nutrient). Upper limit: No established UL.
What is NAC used for?
NAC (N-acetyl cysteine) helps the body make glutathione and supports respiratory and liver health. In apiece it is part of formulas for Immune support, Healthy aging.*
Who should be careful with NAC?
apiece’s safety rules leave it out or limit it with: Nitrate; Chemotherapy or targeted cancer pills; Radiation therapy; Cancer immunotherapy; Pregnancy; Breastfeeding; Trying to conceive. Check with your doctor or pharmacist if any apply to you.
Can I get NAC in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. NAC can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.