NAC (N-Acetyl L-Cysteine)


Searching for a super nutrient to boost your health and longevity? N-Acetyl L-Cysteine (NAC) is a powerful neuroprotective antioxidant that supports healthy glutathione levels, can reduce oxidative stress, and promotes detoxification and fertility.* It also supports respiratory and immune function, liver and kidney activity, and cognition.*

In stock

Free shipping on all subscriptions & US orders over $75*

Cancel Any Time | 100% Money Back Guarantee | Refund Policy

Blood Sugar Balance

Blood Sugar Balance

Supports healthy blood sugar and insulin level
Brain Health

Brain Health

Supports optimal brain function with key brain-healthy nutrients


Provides antioxidant support and immune system boosters


Supplement Facts
Serving Size 1 Capsule
Servings Per Container 60
Amount Per Serving % DV
N-Acetyl L-Cysteine

600 mg

Other Ingredients: Hydroxypropyl methylcellulose, rice bran extract, microcrystaline cellulose, vegetable magnesium stearate, silica.
  • Soy Free
  • Corn Free
    Corn Free
  • Gluten Free
  • No Artificial Flavorings
    No Artificial Flavoring
  • No Artificial Colorings
    No Artificial Coloring
  • Dairy Free
    Dairy Free
  • Sugar Free
  • Egg Free
    Egg Free
  • Vegan

Month 1

Clinically studied nutrients get to work

Month 2-3

Nutritional deficiencies are corrected (varies by person)

Month 4 & Beyond

Amplify the benefits & support long-term health

Next-Level Nutrition

Unlike other NAC supplements, BrainMD’s N-Acetyl L-Cysteine NAC supplement contains 600 mg of NAC, the exact dose studied in leading clinical trials.1,2,3 When consumed, NAC breaks down into cysteine (a non-essential amino acid), then metabolizes into glutathione, the body’s master antioxidant and most integral part of the detoxification system.*

Without sufficient glutathione, your brain and body can’t function at their best. Supplementing with glutathione’s precursor, N-Acetyl L-Cysteine, can help keep your cells energized, your immune system firing on all cylinders, and support your brain health.*


“If you want to fight back against premature aging like I do, you’re going to love BrainMD’s NAC.”

- Daniel G. Amen, MD 

For Anti-Aging & Longevity: NAC And The Fountain Of Youth

If you want to age gracefully, take NAC. 

Studies show that oxidative damage can play a significant role in the development of age-related issues.4* By preventing autoxidation within the body, NAC protects against organ damage and promotes a longer and healthier life.*

Modern Living Breaks Down Your Immune System, NAC Helps Build It Back Up

Aside from increasing glutathione levels, NAC supports the production and function of immune cells and boasts powerful mucolytic and antiviral properties.* Research shows that NAC can help break up mucus, reduce coughing and wheezing, and support long-term lung health.5* Some doctors consider NAC the best line of defense against lingering respiratory ailments and regularly recommend it to their patients for its outstanding ability to optimize the body’s resistance against oxidative stress.* 

What The Science Says

  • When given as a supplement for 3 years, 600 mg of NAC decreased exacerbation rates (flare ups) in people with smoking-related lung problems.5*
  • One randomized, double-blind study conducted in 70 subjects dealing with inflammation found that NAC supplementation stabilized lung function better than the placebo.6*
  • A recent meta analysis conducted in double-blind, placebo controlled studies found that giving a prolonged course of supplemental NAC can help prevent lung and respiratory problems.7*
  • One study conducted in 135 subjects with mild cognitive impairment found that 600 mg/daily of NAC for one year improved cognitive performance, memory, mood, and behavioral functions.1*

Clinically Researched Benefits

As a company firmly rooted in science, we use only clinically researched ingredients that create real results. Here are some of the benefits of taking BrainMD’s NAC supplement:

  • Enhanced immunity*
  • Optimal brain function*
  • Healthy glutathione levels*
  • Antioxidant protection & detoxification*
  • Fertility support*
  • Improved respiratory congestion & lung health*


  1. Tardiolo G, Bramanti P, Mazzon E. Overview on the Effects of N-Acetylcysteine in Neurodegenerative Diseases. Molecules. 2018; 23(12):3305.
  2.  Raghu, G., Berk, M., Campochiaro, P. A., Jaeschke, H., Marenzi, G., Richeldi, L., Wen, F. Q., Nicoletti, F., & Calverley, P. M. A. (2021). The Multifaceted Therapeutic Role of N-Acetylcysteine (NAC) in Disorders Characterized by Oxidative Stress. Current neuropharmacology, 19(8), 1202-1224.​​
  3. Safarinejad, M. R., & Safarinejad, S. (2009). Efficacy of selenium and/or N-acetyl-cysteine for improving semen parameters in infertile men: a double-blind, placebo controlled, randomized study. The Journal of urology, 181(2), 741–751.
  4. Tan BL, Norhaizan ME, Liew WP, Sulaiman Rahman H. Antioxidant and Oxidative Stress: A Mutual Interplay in Age-Related Diseases. Front Pharmacol. 2018;9:1162. Published 2018 Oct 16. doi:10.3389/fphar.2018.01162
  5. Laniado-Laborín R. Smoking and chronic obstructive pulmonary disease (COPD). Parallel epidemics of the 21 century. Int J Environ Res Public Health. 2009;6(1):209-224. doi:10.3390/ijerph6010209
  6. Conrad C, Lymp J, Thompson V, Dunn C, Davies Z, Chatfield B, Nichols D, Clancy J, Vender R, Egan ME, Quittell L, Michelson P, Antony V, Spahr J, Rubenstein RC, Moss RB, Herzenberg LA, Goss CH, Tirouvanziam R. Long-term treatment with oral N-acetylcysteine: affects lung function but not sputum inflammation in cystic fibrosis
  7. Grandjean EM, Berthet P, Ruffmann R, Leuenberger P. Efficacy of oral long-term N-acetylcysteine in chronic bronchopulmonary disease: a meta-analysis of published double-blind, placebo-controlled clinical trials. Clin Ther. 2000 Feb;22(2):209-21. doi: 10.1016/S0149-2918(00)88479-9. PMID: 10743980.
Frequently Asked Questions
How do I take BrainMD NAC?
Adults should take BrainMD NAC by mouth once or twice daily. Similar to other amino acids, it is recommended to take the NAC supplement either 30 minutes before or 2 hours after eating a meal to avoid competing with protein for absorption.
Can this supplement make me dependent on it, or addicted?
No. Like other BrainMD products this is a dietary supplement, not a drug, and is not habit-forming.
Is this product safe to take during pregnancy?
NAC should be taken under the guidance of a nutritionally informed health care professional. If you are pregnant or breastfeeding it is best to speak with your healthcare provider before starting any supplement.
Which other supplements would make this supplement work even better?
NAC is an excellent adjunctive supplement in certain populations. When taken with selenium, in some men it has been shown to improve semen quality. In the elderly population, research suggests that when taken with Glycine, they synergistically work as a neuroprotective supplement to fight free radicals and oxidative stress.3,4
Where should I store BrainMD’s NAC supplement?
It is recommended that it is stored in cool and dry conditions protected from water, sunlight, and heat.