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NOW Foods NAC 600 mg bottle
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NOW Foods NAC 600 mg Review

N-Acetyl Cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures and is a precursor to the powerful antioxidant glutathione.

Product Focus: Lungs and Breathing
Tier ⓘ
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Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
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How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
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Biohacker Mentions
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Cost per month
$11
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Study, Trial or Testing Result SummaryMembersHuman studies

19 of these 96 human studies gave the ingredient by drip or inhaler, not by mouth.

N-acetyl cysteine, taken here at 1200 mg a day ( the 400 mg that in studies), has but evidence for long-term lung disease. A review of 38 trials in over 10,000 adults with chronic bronchitis or chronic obstructive lung disease found it the chance of staying free of flare-ups, with little on lung function or quality of life. …

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Review Totals and SummaryMembers80 reviews
80 reviews · Nowfoods 73 · Celebratevitamins 7

Real user feedback for NAC 600 mg, gathered from sources like Nowfoods and Celebratevitamins, reveals that reviewers have had a experience. users specifically highlight how this supplement fits easily into their daily wellness routines, with sharing that they noticed after integrating it into their regimen. …

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Biohacker SummaryMembersWhat our biohacker panel says

The main reason is to support the body's own glutathione, an antioxidant, and detoxification, and some also mention breaking up bacterial biofilms, handling air pollution, or mercury, which one of them says he by taking it. One says it alongside glycine, and another says selenium is needed for glutathione recycling, while doses or preferred forms are given. …

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RAL SummaryMembersThe tier and why

Evidence for N-acetyl cysteine is for flare-ups but . …

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Respiratory system. Combine with and possible side are for members.

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Supplement FactsSelenium 25 mcg · Molybdenum 50 mcg · N-Acetyl Cysteine 600 mg
Supplement Facts
Serving Size 1 Capsule
Servings Per Container 250
Amount Per Serving% Daily Value
Selenium (from L-Selenomethionine)25 mcg45%
Molybdenum (from Sodium Molybdate)50 mcg111%
N-Acetyl Cysteine (NAC)600 mg†
† Daily Value not established.

Directions: Take 1 capsule twice daily.

Barcode (UPC) 733739001832 · Label source: the brand's label · Report a label change

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Graded October 23, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.