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N-Acetyl cysteine (NAC)
Full ranking Dose tool Products (830)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Authoritative daily maximum: 600 mg
Median（Per day）300 mgP5 41.7 – P95 800
Products830
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=n-acetyl-l-cysteine2&lang=en · Health Canada NNHPD monograph: not to exceed 600 mg NAC/day
Daily dose across products（mg/day）
Authoritative daily maximum 600
5 mglog scale · n=8303,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Nature's Sunshine | N-Acetyl Cysteine | 600 mg | 90.0 |
| 1 | Swanson | N-Acetyl Cysteine 600 mg | 600 mg | 90.0 |
| 1 | XYMOGEN | NAC N-Acetyl Cysteine | 600 mg | 90.0 |
| 4 | GNC | N-Acetyl-L-Cysteine NAC 600 mg | 600 mg | 88.0 |
| 4 | Twinlab | NAC (N-Acetyl-Cysteine) | 600 mg | 88.0 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.