NOW Foods
NAC 1000 mg
85/100
SUPPIE SCORE
85/100
EFFICACY
High
SAFETY
80/100
CLEANLINESS
What Does NAC 1000 mg Do?
NOW Foods NAC 1000 mg offers a high-dose, evidence-backed formula for antioxidant protection, immune and liver support. Dosage aligns with clinical studies showing strong benefits for detoxification. Overall safe with minimal GI side effects; ideal for adults seeking reliable NAC supplementation.
What are the main benefits of NAC for immune support?
How does NAC support liver health, and what dosage is effective?
Are there any long-term effects of taking NAC supplements?
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What Are the Benefits of NAC 1000 mg?
Based on proven scientific research
Free Radical ProtectionStrong
Immune System SupportModerate
Liver Health SupportVery strong
Glutathione ProductionStrong
Good For:
What Are the Side Effects of NOW Foods NAC 1000 mg?
Always consult your health practitioner if in doubt.
RiskLow Risk
Overview
•NAC at 1000 mg is well within safe oral limits (up to 3000 mg/day), with GRAS status and low toxicity for healthy adults.
•Common side effects include mild gastrointestinal issues like nausea or diarrhea, affecting <10% of users at this dose.
•Potential interactions with nitroglycerin or blood thinners; consult physician if on medications, especially for heart conditions.
•Not recommended during pregnancy/nursing without medical advice; avoid in asthma or bleeding disorders due to rare risks.
•Vegetarian formula free of common allergens (wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts, sesame), suitable for most sensitivities.
•GMP-manufactured in USA; no reported contamination issues, but store in cool, dry place to maintain quality.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Microcrystalline cellulose
Low RiskHydroxypropyl cellulose
Low RiskStearic acid (vegetable source)
Low RiskCroscarmellose sodium
Low RiskVegetarian coating (hypromellose (cellulose))
Low RiskSunflower lecithin
Low RiskTriethyl citrate
Low RiskSunflower oil
Low RiskSilicon dioxide
Low RiskWhat Are the Ingredients in NOW Foods NAC 1000 mg?
N-Acetyl Cysteine (NAC)
1,000 mg
Microcrystalline Cellulose
Hydroxypropyl Cellulose
Stearic Acid (vegetable source)
Croscarmellose Sodium
Vegetarian Coating (hypromellose (cellulose))
Sunflower Lecithin
Triethyl Citrate
Sunflower Oil
Silicon Dioxide
Dosage & Bioavailability
How the active doses and forms in NAC 1000 mg compare to the research.
•N-Acetyl Cysteine (NAC) — 1,000 mg per serving; within the 900-1,800 mg/day used in studies.
Sources & References
Now foods nac 1 000 mg 120 tablets
Information from www.iherb.com
Nac 1000 mg tablets
Information from www.nowfoods.com
PMC7892733
Information from pmc.ncbi.nlm.nih.gov
PMC8234027
Information from pmc.ncbi.nlm.nih.gov
PMC8284175
Information from pmc.ncbi.nlm.nih.gov
Nac 600 mg capsules
Information from www.nowfoods.com
Supplements
Information from examine.com
NBK537183
Information from www.ncbi.nlm.nih.gov
B00KT3H13C
Information from www.amazon.com
PMC5241507
Information from pmc.ncbi.nlm.nih.gov
Drg 20311314
Information from www.mayoclinic.org
PMC9095537
Information from pmc.ncbi.nlm.nih.gov
N acetylcysteine
Information from www.webmd.com
Fdas safety review of nac to go under peer review
Information from www.nutraceuticalsworld.com
Supplements
Information from www.nowfoods.com
PMC8211525
Information from pmc.ncbi.nlm.nih.gov
Fda releases final guidance enforcement discretion certain nac products
Information from www.fda.gov
PMC6566037
Information from pmc.ncbi.nlm.nih.gov
PMC10839595
Information from pmc.ncbi.nlm.nih.gov
PMC11499967
Information from pmc.ncbi.nlm.nih.gov
PMC8129408
Information from pmc.ncbi.nlm.nih.gov
N acetyl cysteine uses and risks
Information from www.webmd.com
PMC5788395
Information from pmc.ncbi.nlm.nih.gov
N acetyl cysteine nac
Information from www.webmd.com
PMC1513138
Information from pmc.ncbi.nlm.nih.gov
PMC7649937
Information from pmc.ncbi.nlm.nih.gov
Frequently Asked Questions
Common questions about NOW Foods NAC 1000 mg