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NAC

Also known as N-acetylcysteine

What it is: Precursor to glutathione and mucolytic agent
What it does: Supports glutathione synthesis and reduces mucus viscosity in respiratory tissues
Status: Widely used supplement
Evidence: Moderate. Extensive human data.
Uses: Respiratory support; antioxidant support; liver and metabolic protocols

Caution. May cause GI upset; can interact with some medications.

Summary

NAC is a derivative of the amino acid cysteine that serves as a precursor for glutathione synthesis and also acts as a mucolytic in respiratory care. It is used in antioxidant, liver, and metabolic protocols, and has a long history in clinical settings for specific indications. GI tolerance is generally good, though some people experience nausea or reflux.

Checked Jul 19, 2026.

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This entry summarises published information in plain language. It is not medical advice, a dosing recommendation or a substitute for a qualified healthcare professional. Many peptides are not approved for human use, and legal status varies by country. Check anything you rely on against primary sources.