10 Best Nac Supplement Natural Factors of 2025

Tested and Reviewed: Top 10 Nac Supplement Natural Factors deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

Nutricost

Nutricost N-Acetyl L-Cysteine (NAC) 600mg, 180 Capsules - Non-GMO, Gluten Free

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Editor's bottom line:

“This nac supplement natural factors is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

600mg of High Quality N-Acetyl L-Cysteine (NAC) Per Capsule
180 "Veggie" Capsules Per Bottle
Vegan, Non-GMO & Gluten Free
Made In a NSF Certified, GMP Compliant FDA, Registered Facility
3rd Party Tested By Independent, ISO-Accredited Laboratories

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Picked by 397 people today

9.5

Natural Factors

Natural Factors N-Acetyl-L-Cysteine 500 mg - Supports Healthy Liver & Lungs - Antioxidant Support Supplement Supports Immune System Health - 90 Vegetarian Capsules (90 Servings)

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Main Highlights

Immune Health Supplement: N-Acetyl-L-Cysteine is a dietary supplement that supports natural glutathione production and immune system function
Liver & Lung Health Support: Offers antioxidant support for healthy liver and lung function, aiding the body's resilience and overall health
Cellular Health Support: To support immune and cellular health, take 1 capsule 23 times per day or as directed by a health professional
Antioxidant Support Supplement Formula: This immune support supplement is free from dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, salt, tree nuts, and GMOs
About Natural Factors: Natural Factors is a family-owned B-Corp, Carbon Neutral, and 3rd Party with direct ownership of all manufacturing stages to ensure the highest quality supplements

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9.5

Natural Factors

Natural Factors N-Acetyl-L-Cysteine 600 mg - Supports Healthy Liver & Lungs - Antioxidant Support Supplement Supports Immune System Health - 60 Vegetarian Capsules (60 Servings)

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Main Highlights

Immune Health Supplement: N-Acetyl-L-Cysteine is a dietary supplement that supports natural glutathione production and immune system function
Liver & Lung Health Support: Offers antioxidant support for healthy liver and lung function, aiding the body's resilience and overall health
Cellular Health Support: To support immune and cellular health, take 1 capsule 1 time per day or as directed by a health professional
Antioxidant Support Supplement Formula: This immune support supplement is free from dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, salt, tree nuts, and GMOs
About Natural Factors: Natural Factors is a family-owned B-Corp, Carbon Neutral, and 3rd Party with direct ownership of all manufacturing stages to ensure the highest quality supplements

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9.2

NOW Foods

NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules

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Main Highlights

FREE RADICAL PROTECTION*: Take 1 NAC capsule with selenium twice daily for free radical protection and to maintain cellular health*
IMPORTANT NOTE ABOUT THIS PRODUCT: Black spots may appear in NAC because of a normal oxidative reaction, but product is safe to consume. These spots are NOT mold or any other micro-contamination. Micro-testing has been performed to assess product safety
CERTIFICATIONS/CLASSIFICATIONS: Non-GMO, Made without Gluten, Kosher, Dairy Free, Egg Free, Nut Free, Soy Free,
GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
Packaged in the USA by a family owned and operated company since 1968

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9.0

Pure Encapsulations

Pure Encapsulations NAC 600 mg - N-Acetyl Cysteine NAC Supplement for Lung Health & Immune Support, Liver Support & Antioxidants* - with Freeform N-Acetyl-L-Cysteine - 90 Capsules

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Main Highlights

N Acetyl Antioxidant Support: NAC provides powerful nutritional support as an antioxidant, supporting lung functioning through its mucolytic capability*
Lung Support Supplement: NAC N-Acetyl Cysteine supports lungs and their functioning through its mucolytic and antioxidant action*
Antioxidants Supplement: N-Acetyl Cysteine (NAC) is a precursor to the antioxidant glutathione; supplemental NAC supports tissue levels of glutathione*
Liver Support Supplement: The supplement N Acetyl Cysteine supports liver health and detoxification*; formula is free from gluten, wheat, and more
Pure Difference: What we leave out matters, too; Pure Encapsulations products are free from common allergens, artificial or unnecessary ingredients, and GMOs

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8.8

THORNE

THORNE - NAC - N-Acetylcysteine - 500mg - Supports Respiratory Health & Immune Function - Promotes Liver & Kidney Detox* - Gluten, Dairy & Soy-Free - 90 Servings

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Main Highlights

Immune Support: Enhances immune function by supporting the production and function of immune cells*
Respiratory Benefits: Helps break up mucus, supporting the natural clearance process in the lungs and sinuses, and promotes normal inflammatory response*
Detox Benefits: Enhances antioxidant activity to promote a normal inflammatory response in the lungs*
Third-Party Certified: This product has been third-party tested and certified to verify what's in the package matches what's on the label and to confirm it contains no unsafe levels of contaminants
Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners (2023 Health-Care Practitioner Seller Survey)

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8.6

NOW Foods

NOW Foods Supplements, NAC (N-Acetyl-Cysteine) 1,000 mg, Free Radical Protection*, 120 Tablets

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Main Highlights

FREE RADICAL PROTECTION*/NORMAL IMMUNE SYSTEM FUNCTION*: N-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine
MAINTAINS CELLULAR HEALTH*: NAC can help to support healthy brain and neuronal tissues*
CLASSIFICATIONS/CERTIFICATIONS: Kosher, Non-GMO, Soy Free, Nut Free, Made without Gluten, Dairy Free, Egg Free
GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
Packaged in the USA by a family owned and operated company since 1968

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8.3

Life Extension

Life Extension N-Acetyl-L-Cysteine (NAC), Immune, Respiratory, Liver Health, NAC 600 mg, Potent antioxidant Support, Free-radicals, Easy to Absorb, 60 Capsules

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Main Highlights

Whole-body health all-star nutrient N-Acetyl-L-Cysteine (NAC for short) provides head-to-toe benefits. NAC is good for your respiratory system, liver health and immune response. Studies show NAC favorably affects cellular energy production, well-being and quality of life.
Powerful protection against oxidative stress High-performing organs like your liver are exposed to free-radical agents that cause oxidative stress. N-Acetyl-L-Cysteine is a potent free-radical scavenger that combats oxidative stress. The body also uses NAC to replenish glutathione, a naturally occurring antioxidant that also helps protect your cells against oxidative stress.
Easy-to-absorb NAC Each gluten-free capsule delivers 600 milligrams of N-Acetyl-L-Cysteine thats rapidly absorbed by the body, giving you the maximum benefits of this potent nutrient.
Ingredients matter We use the finest raw ingredients chosen for quality and purity. The majority of our products are non-GMO, gluten-free and manufactured in the USA with globally sourced ingredients, and a Certificate of Analysis is available for each.
Live your healthiest life For over 40 years, weve been developing advanced, effective formulas made with the highest standards and based on the latest scientific findings. We believe the answers to a healthier, richer life are within reach, and that rigorous scientific research is the path to get us there. Thats why so many of our nutritional formulas are designed using specific ingredients and amounts based on scientific studies.

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8.1

Natural Factors

Natural Factors Lung, Bronchial & Sinus Health - Respiratory Health Supplement - Supports Lung & Sinus Health - Supports Healthy Lung Tissue & Mucus Consistency - 90 Tablets (90 Servings)

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Main Highlights

Supplement for Respiratory Support: This lung supplement is crafted to support healthy lung tissue and your respiratory system
Herbal Supplement Formula: Combining N-acetyl-L-cysteine, bromelain, and traditional herbs for a supplement that supports already healthy lung function and clear sinus and bronchial pathways
Clear Sinus Support Supplement: For sinus and bronchial support, take 1 tablet 34 times per day or as directed by a health professional
Lung Health Support: This health supplement is free from sugar, wheat, gluten, yeast, soy, egg, fish, shellfish, salt, tree nuts, and GMOs
About Natural Factors: Natural Factors is a family-owned B-Corp, Carbon Neutral, and 3rd Party with direct ownership of all manufacturing stages to ensure the highest quality supplements

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8.1

Integrative Therapeutics

Integrative Therapeutics NAC - Antioxidant Support Supplement for Respiratory & Lung Function* - Gluten-Free & Dairy-Free - 60 Capsules (60 Servings)

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Main Highlights

Cellular Health Support*: N-Acetyl L-Cysteine (NAC) helps to support intracellular glutathione, which is vital in cellular antioxidant pathways*
Respiratory & Lung Function Support*: This lung health supplement supports healthy respiratory and lung function in men and women*
Supplement with Antioxidant Support*: The supplemental NAC (N-Acetyl L-Cysteine) supports the body levels of glutathione*
Gluten-Free & Dairy-Free: NAC contains no wheat, gluten, corn, soy, dairy products, or artificial colors, flavors, or preservatives
About Integrative Therapeutics: For over 25 years, patients and clinicians have trusted us for our dedication to quality, potency, and accuracy; transparency around our sourcing and manufacturing processes is part of our quality promise to you

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Our Best Overall Choice

Best Choice

9.7

Nutricost

Nutricost N-Acetyl L-Cysteine (NAC) 600mg, 180 Capsules - Non-GMO, Gluten Free

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Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

600mg of High Quality N-Acetyl L-Cysteine (NAC) Per Capsule
180 "Veggie" Capsules Per Bottle
Vegan, Non-GMO & Gluten Free
Made In a NSF Certified, GMP Compliant FDA, Registered Facility
3rd Party Tested By Independent, ISO-Accredited Laboratories

Show Price

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