NAC (N-Acetyl Cysteine)
NAC (N-Acetyl Cysteine)

"I feel less fatigued, experiences relatively lesser mood swing and am in better control of my post meal sugar cravings. Will definitely be buying again!"

Kanikaa K, Verified buyer

NAC (N-Acetyl Cysteine)

N-acetylcysteine (NAC) is a promising antioxidant, shown to have positive effects on insulin, testosterone, ovulation and weight management for women with PCOS*.
17 reviews
Regular price$22.95
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Regular price$22.95
  • May positively affect ovulation, insulin sensitivity, and testosterone levels in women with PCOS with little to no side effects*
  • Avoid the infamously unpleasant taste with easy-to-take capsules
  • Providing 500-1000mg of NAC per serving (1 capsule)
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Product Highlights

  • Small, easy-to-swallow capsules providing 500-1000mg of pleasantly tasteless NAC.
  • Provides all the benefits of an antioxidant, while potentially improving metabolic health in women with PCOS*
  • Comparable to Metformin for its effect on metabolic factors, without the possible side effects*

N-acetyl cysteine (NAC) is a supplement form of cysteine, a semi-essential amino acid. NAC is found in high-protein foods, such as turkey and chicken, and can be very useful for several health reasons. One of which is that it replenishes the most potent antioxidant in your body, glutathione.

Its versatility and impact on metabolic and hormonal health, particularly for women with PCOS*, has led to NAC becoming one of our most bought & loved supplements. Paired with regular exercise and a healthy diet, it can be a supportive aid in your journey toward balance.

Ingredients (per serve): 100% pure n-acetyl cysteine (NAC), providing 500mg - 1000mg

N-Acetyl Cysteine (NAC) may:

  • Contribute to a healthier body mass index (BMI) and waist circumference*
  • Positively affect fasting insulin levels, glucose/insulin ratio, and aid in insulin sensitivity*
  • Improve rates of ovulation, increasing the chances of conception for women with PCOS*
  • Reduce androgen levels, including total testosterone and free androgen index - commonly high in PCOS*
  • Reduce inflammatory markers*
  • Combat oxidative stress, which is often elevated in PCOS*
  • Safe whilst TTC
  • Pregnancy & Breastfeeding Safe
  • Vegetarian & Vegan Friendly

FDA & Product Disclaimer

*FDA regulations strictly prohibit the use of therapeutic or medical claims in conjunction with the sale of any product not approved by the FDA. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

*The information and products presented on this website are not intended as a substitute for the advice or medical care of a qualified physician. No action should be taken solely on its content. You should not use the information on this web site for diagnosing or treating a health problem or disease, or prescribing any medication or other treatment.

*Dietary supplements supplied by Health & Balance Vitamins Pty Ltd should always be consumed as part of a holistic plan that incorporates nutrition, exercise, stress management and quality sleep. We do not recommend using this product in the absence of the aforementioned lifestyle factors.

*This product is a dietary supplement.


Song, Y., Wang, H., Huang, H., & Zhu, Z. (2020). Comparison of the efficacy between NAC and metformin in treating PCOS patients: a meta-analysis. Gynecological Endocrinology, 36(3), 204-210.

Sandhu, J. K., Waqar, A., Jain, A., Joseph, C., Srivastava, K., Ochuba, O., ... & Poudel, S. (2021). Oxidative stress in polycystic ovarian syndrome and the effect of antioxidant N-acetylcysteine on ovulation and pregnancy rate. Cureus, 13(9).

Asl, Z. S., Parastouei, K., & Eskandari, E. (2023). The effects of N-acetylcysteine on ovulation and sex hormones profile in women with polycystic ovary syndrome: A systematic review and meta-analysis. British Journal of Nutrition, 1-28.

Chandil, N., Pande, S., Sen, S. S., & Gupta, D. (2019). Comparison of metformin and N acetylcysteine on clinical, metabolic parameter and hormonal profile in women with polycystic ovarian syndrome. The Journal of Obstetrics and Gynecology of India, 69, 77-81.

Thakker, D., Raval, A., Patel, I., & Walia, R. (2015). N-acetylcysteine for polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled clinical trials. Obstetrics and Gynecology International, 2015.

Javanmanesh, F., Kashanian, M., Rahimi, M., & Sheikhansari, N. (2016). A comparison between the effects of metformin and N-acetyl cysteine (NAC) on some metabolic and endocrine characteristics of women with polycystic ovary syndrome. Gynecological endocrinology, 32(4), 285-289.

Fulghesu, A. M., Ciampelli, M., Muzj, G., Belosi, C., Selvaggi, L., Ayala, G. F., & Lanzone, A. (2002). N-acetyl-cysteine treatment improves insulin sensitivity in women with polycystic ovary syndrome. Fertility and sterility, 77(6), 1128-1135.

Can NAC be taken with birth control?


Can I take more than once daily?

The dose of NAC used in clinical trials has ranged from about 600 mg to 3,000 mg per day, typically divided into two or three servings. Generally because most customers are taking other products also, only one capsule per day is generally needed.

Why does my NAC smell rotten?

The odour you smell is likely from the sulphur that is part of NAC (N-acetyl-cysteine), this is completely normal and why it is in a capsule and not a powder.

Take 1 capsule with your largest meal. Can be taken twice daily if needed. Only 30 capsules per packet.

Note: When you open your packet you may get a strong unpleasant smell. This is nothing to be concerned about, it is simply because it is derived from sulphur and once consumed you'll get no taste or aftertaste.

Customer Reviews
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Kimberly H.
United States

Good product

The product seemed great I just hate it takes so long to ship to US.

Dana B.
United States United States

NAC is amazing!

I bought NAC on a 30 day supply one time only. because I was cautiously optimistic about this. I've tried all kinds of diets INCLUDING a pcos diet and nothing! I literally started NAC 2... DAYS... AGO!!! I already feel more normal and energetic then I've been in 2 YEARS! I deal with chronic migraines everyday that just wipe me. My daily mantra used to be " just go with your energy when you have it" I'd have to choose between daily activities. Today I could do everything I wanted to do! Amazing! I'm back today to put this stuff on autoship since I'm in the US.

United States United States

Only place to buy NAC

I’ve been taking NAC for a couple of years now. I live in the US and it’s unfortunately no longer sold here. This company is the only place I can currently find NAC! Definitely recommend for PCOS, liver, and lung issues.

United States United States


Love the pills instead of powder. Much better without the bitter taste.

Christina H.
United States United States

Would buy again

I am very happy with this product