N-Acetyl Cysteine (NAC) and Fertility in Women with Polycystic Ovary Syndrome (PCOS): A Comprehensive Review

Navigating the complex world of Polycystic Ovary Syndrome (PCOS) can be a daunting task, especially when it comes to fertility. But what if there was a supplement that could help? Enter N-Acetyl Cysteine (NAC), a powerful antioxidant that's shown great promise for improving fertility.

In this comprehensive review, we'll delve into the intricate relationship between NAC and fertility in women with PCOS. From understanding the role of NAC in managing PCOS to exploring how it can enhance fertility, we'll guide you through the latest research and findings.

Understanding PCOS and Its Impact on Fertility

Polycystic Ovary Syndrome (PCOS) is a complex hormonal disorder that affects one in ten women of reproductive age worldwide. It's a condition that can have far-reaching impacts, particularly when it comes to fertility. This section aims to delve into the intricacies of PCOS, shedding light on how it influences fertility and the challenges women with this condition often face when trying to conceive.

We'll explore the underlying mechanisms of PCOS, its association with hormonal imbalances, and how these factors can disrupt normal ovulation - a crucial process for conception. We'll also discuss the common treatments available and their effectiveness in managing fertility issues associated with PCOS.

What is PCOS?

Polycystic Ovary Syndrome, often referred to as PCOS, is a common hormonal disorder that affects women of reproductive age. It's a condition that's often characterised by small cysts on the ovaries, but it's much more than that. PCOS is a complex disorder that can impact various aspects of a woman's health.

The name might suggest it's all about the ovaries, but PCOS is actually a problem with the body's endocrine system, which is the network of glands that produce and regulate hormones. In women with PCOS, the endocrine system is out of balance, leading to higher levels of certain hormones, including insulin and androgens - the so-called 'male hormones'.

This hormonal imbalance can cause a variety of symptoms. Some women might experience irregular periods or even no periods at all. Others might notice physical changes like acne, weight gain, or excessive hair growth. But the effects of PCOS go beyond these visible symptoms. It can also lead to serious health issues like insulin resistance, type 2 diabetes, and heart disease.

But what about fertility? Well, that's another area where PCOS can have a significant impact. The hormonal imbalance in PCOS often leads to problems with ovulation, which is crucial for fertility. This is why many women with PCOS struggle to conceive. But don't lose hope just yet. There are natural solutions available, and we'll be diving into one of them - N-Acetyl Cysteine (NAC) - in the next sections.

How PCOS Affects Fertility

Polycystic ovary syndrome, or PCOS, is a common hormonal disorder that can have a significant impact on a woman's fertility. It's a bit of a double-edged sword, really. On one hand, it can lead to irregular ovulation or even anovulation, which is when the ovaries don't release an egg during a menstrual cycle. This can make it more difficult for women with PCOS to conceive naturally.

On the other hand, PCOS is also associated with higher levels of insulin and androgens, which can lead to metabolic disorders such as diabetes and cardiovascular diseases. These conditions can further complicate a woman's fertility journey.

The first line of treatment for women with PCOS who are trying to conceive is often clomiphene citrate^1. However, the success rate of this treatment can be quite varied. While it can stimulate ovulation in 75% to 80% of women, the conception rates are significantly lower, only around 30% to 40%.

For women who don't respond to clomiphene citrate, the options are limited and often involve more invasive treatments like gonadotropin therapy or laparoscopic ovarian drilling. It's a challenging journey, to say the least. But, as with any health condition, understanding the impact of PCOS on fertility is the first step towards finding the right treatment.

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Introduction to N-Acetyl Cysteine (NAC)

In our exploration of N-Acetyl Cysteine (NAC), we'll delve into its unique characteristics and potential benefits. This antioxidant, known for its dual role in the human body, has been the subject of numerous studies, particularly in relation to Polycystic Ovary Syndrome (PCOS) and female fertility.

NAC's multifaceted nature and its potential to support overall health make it a compelling topic to explore. Let's begin our journey by understanding what NAC is and how it works in our bodies.

What is NAC?

N-Acetyl Cysteine, or NAC for short, is a bit of a superstar in the world of antioxidants. It's not just any old antioxidant, though. It's also an amino acid, which are the building blocks of protein. But what sets NAC apart is that it's a derivative of another amino acid, L-cysteine.

This is important because L-cysteine is a precursor used by our bodies to produce glutathione. Now, glutathione is a big deal. It's a powerful antioxidant that our bodies produce to protect against free radical damage. It's also a critical factor in supporting a healthy immune system.

So, in essence, NAC is a bit of a double whammy. It's an antioxidant in its own right, and it also helps our bodies to produce another important antioxidant. It's like a superhero with a sidekick, both fighting against the bad guys - in this case, free radicals that can cause cell damage.

NAC is also used widely across Europe as a treatment for the common cold^2. It has a whole host of other uses too, from treating bronchitis to removing heavy metals and environmental pollutants from the body.

But, as with any superhero, NAC does have its kryptonite. It can cause gastrointestinal adverse effects, including nausea, abdominal pain, vomiting, constipation, and diarrhea, particularly when used in high doses. So, as always, it's important to discuss use with your doctor or healthcare professional before taking.

How NAC Works

In a nutshell, NAC works by increasing our bodies' production of glutathione. This helps neutralize or repair damaged cells, which is especially important for women with Polycystic Ovary Syndrome (PCOS). Research shows that women with PCOS have higher levels of oxidative stress, which can contribute to ovarian dysfunction and hormone imbalance.

By boosting glutathione production, NAC can help combat this oxidative stress, potentially improving ovarian function and balancing hormones. It's a pretty cool process, and it's just one of the many ways that NAC can support overall health and wellbeing.

NAC and PCOS: The Connection

This section delves into the connection between NAC and PCOS, shedding light on how this dietary supplement can potentially aid in managing this condition. From hormonal balance to insulin regulation, NAC's multifaceted role in PCOS management is certainly worth exploring. Let's dive in and uncover the potential benefits of NAC for women with PCOS.

NAC's Role in PCOS Management

One of the key benefits of NAC is its ability to balance certain hormones^3. This is a game-changer for women with PCOS, as hormonal imbalance is a common issue they face.

But NAC doesn't stop there. It's also been found to improve insulin levels^4, which is a big deal considering that insulin resistance is a common symptom of PCOS.

NAC has also shown promise in improving fertility^5 among women with PCOS. This is a ray of hope for those struggling with infertility, a common problem for women with this condition.

Before starting any new supplement, it's always best to consult with your doctor or healthcare professional. They can provide guidance on the appropriate dosage and monitor your progress.

NAC vs. Metformin in PCOS

NAC and Metformin, both have been studied extensively for their role in managing PCOS. But how do they stack up against each other? Let's dive in.

Studies^6 have shown that NAC, when taken at a dose of 600mg three times a day, can have similar effects to Metformin, which is typically prescribed at a dose of 500mg three times a day. This is particularly true when it comes to improving insulin resistance and lowering cholesterol levels.

However, it's not all a tie. Women who took NAC were found to be 87% less likely to ovulate compared to those on Metformin. This could be a significant factor for women with PCOS who are trying to conceive.

On the flip side, NAC has been shown to reduce BMI significantly compared to Metformin. It also reduced total testosterone levels, which could be a boon for those dealing with the symptoms of hyperandrogenism associated with PCOS.

NAC and Fertility in Women with PCOS

The promising role of N-Acetyl Cysteine (NAC) in enhancing fertility in women with PCOS has sparked interest in the scientific community. This section delves into the potential of NAC in improving fertility outcomes for women grappling with this hormonal disorder.

We'll explore how NAC works, supported by various studies, to potentially improve fertility in women with PCOS. This exploration is crucial in understanding the potential benefits and implications of NAC supplementation, especially for those seeking to conceive.

How NAC Improves Fertility in PCOS

N-Acetyl Cysteine, or NAC, is a powerful antioxidant that's been making waves in the world of PCOS and fertility. It's a synthetic form of the amino acid cysteine, which is found in high-protein foods like meat and fish. But what's really caught the attention of researchers and women with PCOS alike is its potential to improve fertility.

So, how does NAC work its magic? Well, it's been suggested that NAC can help reduce insulin and testosterone levels in women with PCOS. This is a big deal because high levels of these hormones can interfere with ovulation, making it harder for women with PCOS to get pregnant.

But that's not all. Studies^7 have also linked NAC to an increase in the number of ovulatory follicles and peak endometrial thickness in women with PCOS. This means that NAC could potentially help the ovaries to release more mature eggs, increasing the chances of conception.

But remember, while NAC shows promise, it's not a magic bullet. It's just one piece of the puzzle when it comes to managing PCOS and improving fertility. Always talk to your doctor before starting any new supplement regimen.

Other Studies Supporting NAC's Role in PCOS Fertility

When it comes to the role of NAC in boosting fertility in women with PCOS, several other studies have provided some compelling evidence. A systematic review and meta-analysis published in the Journal of Obstetrics and Gynecology in 2015, for instance, examined eight randomised controlled trials involving 910 women with PCOS.

The review found that NAC significantly improved ovulation rates, as well as pregnancy and live birth rates, compared to a placebo. This suggests that NAC could offer hope to the approximately 70% of women with PCOS who struggle with infertility.

Another study published in the European Journal of Obstetrics, Gynecology, and Reproductive Biology in 2014 found that NAC could also help women who are resistant to Clomid, a common fertility drug. The study found that women taking NAC had a nine times higher ovulation rate and a five times higher pregnancy rate compared to those taking a placebo.

It's also worth noting that NAC has been shown to have similar benefits to metformin, a medication often used to treat PCOS. This includes improving pregnancy rates, spontaneous ovulation, and menstrual regularity.

However, while these studies are promising, it's important to remember that more research is needed to fully understand the role of NAC in PCOS and fertility. As with any treatment, it's crucial to discuss any potential changes to your regimen with a healthcare professional.

Side Effects and Safety of NAC in PCOS

Navigating the world of supplements can be a daunting task, especially when it comes to understanding the potential side effects and safety precautions. This is particularly true for women with Polycystic Ovary Syndrome (PCOS) considering N-Acetyl Cysteine (NAC) as part of their treatment plan.

In this section, we will delve into the side effects and safety of NAC in the context of PCOS, providing you with the information you need to make an informed decision about your health.

Common Side Effects of NAC

NAC is generally well-tolerated by the body. However, like any supplement, it can cause some side effects. The most common ones are related to the digestive system. You might experience nausea, abdominal pain, or even vomiting. Constipation and diarrhoea are also possible, especially when NAC is taken in high doses.

Remember, everyone's body responds differently to supplements. So, while these side effects are common, they don't occur in everyone. And if they do occur, they're usually mild and temporary. But it's always good to be aware of potential side effects when starting a new supplement.

Safety Precautions and Recommendations

While NAC is generally considered safe for most people, it's important to remember that everyone's body is different. Some individuals may experience side effects or have certain conditions that require extra caution.

Firstly, if you're pregnant or breastfeeding, it's crucial to consult your healthcare provider before starting any new supplement, including NAC. While there's no concrete evidence suggesting harm, there's also a lack of studies on NAC's effects in these specific situations.

Secondly, those with asthma should be cautious. Some reports suggest that NAC might cause bronchospasm, a condition that narrows the airways and makes breathing difficult.

Thirdly, if you're scheduled for surgery, it's recommended to stop taking NAC at least two weeks before the procedure. This is because NAC might slow blood clotting, potentially increasing the risk of bleeding during and after surgery.

Lastly, always start with a low dose to see how your body reacts, and never exceed the recommended dosage. Overdoing it can lead to unpleasant side effects like nausea, vomiting, and diarrhoea.

While NAC can be beneficial for many, it's essential to take these precautions and recommendations into account, and to always consult with your doctor to ensure safe and effective use.

NAC Dosage for PCOS and Fertility

In this section, we delve into the specifics of NAC dosage for PCOS and fertility, offering insights that can help you make informed decisions about your health. Remember, it's always best to consult with a healthcare provider before starting any new supplement regimen.

Recommended Dosage of NAC for PCOS

The recommended dosage of N-Acetyl Cysteine (NAC) for women with PCOS is a topic of ongoing research. However, based on current studies^8, the therapeutic dosage of NAC to improve insulin levels is typically between 1.6 to 3 grams per day.

If you're overweight, you might find that the higher end of this dosage range is more beneficial. This is because some studies have found that obese patients with PCOS didn't respond to doses under 3 grams per day.

However, it's crucial to remember that you should never exceed a daily dosage of 7 grams. This is because high doses can cause gastrointestinal side effects, such as nausea, abdominal pain, vomiting, constipation, and diarrhea.

While NAC can be a helpful supplement for managing PCOS and improving fertility, it's not a standalone solution. It should be used as part of a comprehensive treatment plan that includes a healthy diet, regular exercise, and potentially other medications or supplements. Remember, always consult your doctor or healthcare professional before starting a new supplement regimen.

Other Supplements for PCOS and Fertility

While N-Acetyl Cysteine (NAC) has shown promising results in improving fertility among women with PCOS, it's not the only supplement that can help. There are other supplements that can potentially aid in managing PCOS symptoms and enhancing fertility. In this section, we'll explore some of these supplements, including Inositol, Vitamin D, and Omega-3 Fatty Acids. Each of these supplements plays a unique role in the body and may offer specific benefits for women with PCOS. Let's dive in and discover what they have to offer.


In the world of supplements for PCOS and fertility, Inositol is a name that often pops up. It's a type of sugar alcohol that's naturally present in a variety of foods, but is also available in supplement form.

Inositol and in particular myo-inositol, is often hailed as a wonder supplement for women with PCOS due to its insulin-sensitising properties. You see, many women with PCOS struggle with insulin resistance, which can wreak havoc on their fertility.

By improving the body's use of insulin, Inositol can help to regulate menstrual cycles, improve ovulation, and even reduce the levels of male hormones in the body. These effects can be a game-changer when it comes to fertility and it's why myo-inositol is the bedrock of all MyOva PCOS supplements.

However, it's important to remember that while Inositol can be a helpful tool, it's not a magic bullet. It should be used as part of a comprehensive approach to managing PCOS and improving fertility, which may also include lifestyle changes and other supplements.

So, if you're a woman with PCOS and you're trying to conceive, Inositol could be worth considering. But as always, it's best to consult with a healthcare professional before starting any new supplement regimen.

Vitamin D

Vitamin D is another supplement that's been making waves in the PCOS and fertility scene. It's not just about bone health anymore. Recent studies^9 suggest that Vitamin D deficiency could be linked to insulin resistance, a common issue in women with PCOS.

This sunshine vitamin, as it's often called, also plays a key role in the production of sex hormones. These hormones are crucial for regular ovulation and overall fertility.

But here's the kicker, a large number of women with PCOS have been found to be deficient in Vitamin D. So, it's not a stretch to say that supplementing with Vitamin D could potentially help manage PCOS and improve fertility.

However, it's important to remember that while supplements like Vitamin D can help, they're not a magic bullet. They should be part of a larger treatment plan that includes a healthy diet, regular exercise, and medical treatment if necessary.

So, if you're dealing with PCOS and trying to conceive, it might be worth having a chat with your doctor about Vitamin D.

Omega-3 Fatty Acids

Omega-3 fatty acids are another supplement that's worth considering if you're dealing with PCOS and fertility issues. These essential fats are known for their anti-inflammatory properties, which can be beneficial in managing PCOS symptoms.

Omega-3s are also important for hormone regulation, which is crucial for women with PCOS. They can help to balance out some of the hormonal imbalances that are often seen in this condition.

Furthermore, there's some evidence to suggest that omega-3s can support fertility. They're involved in the production of hormones that regulate ovulation and menstrual cycles, which are often disrupted in women with PCOS.

It's always best to consult with a healthcare professional before starting any new supplement regimen. They can provide advice tailored to your specific needs and circumstances.

Lifestyle Changes to Improve PCOS and Fertility

Living with Polycystic Ovary Syndrome (PCOS) can be challenging, but making certain lifestyle changes can significantly improve your symptoms and fertility. This section delves into the various lifestyle modifications that can help manage PCOS and enhance fertility.

From dietary changes to exercise and stress management, these lifestyle adjustments can play a crucial role in regulating your hormones, managing your symptoms, and improving your overall well-being. Let's explore how you can take control of your PCOS and boost your fertility.

Dietary Changes

When it comes to managing PCOS and boosting fertility, dietary changes can play a significant role. It's not just about losing weight, but about adopting a healthier lifestyle that can help manage symptoms and improve overall well-being.

A balanced diet rich in whole foods, lean proteins, fruits, vegetables, and healthy fats can help regulate your menstrual cycle, improve your body's use of insulin, and even promote ovulation.

Limiting processed foods and sugars is also crucial. These can cause inflammation and exacerbate PCOS symptoms.

Remember, it's not about a quick fix, but a long-term commitment to a healthier lifestyle. Small, consistent changes can lead to big improvements over time.

Lastly, don't forget to stay hydrated. Water aids in digestion and can help manage PCOS symptoms.

So, if you're dealing with PCOS and are trying to boost your fertility, consider making some dietary changes. It might just be the key to managing your symptoms and improving your chances of conception.


Exercise can play a pivotal role in managing PCOS and improving fertility. It's not just about shedding pounds, but also about maintaining a healthy body and mind.

Regular physical activity helps in regulating hormones, particularly insulin, which is often out of balance in women with PCOS. This can lead to a reduction in symptoms such as irregular periods and can also enhance fertility.

A mix of both cardio and strength training exercises is recommended. Cardio helps in burning calories and improving heart health, while strength training aids in building muscle mass, which boosts metabolism.

It's important to remember that exercise doesn't have to be strenuous to be effective. Even a brisk walk or a dance class can make a difference.

Every step counts when it comes to managing PCOS and improving fertility.

Stress Management

Living with PCOS can be stressful, and this stress can further exacerbate the symptoms of the condition. It's a vicious cycle, but there are ways to break it. One of the most effective ways is through stress management.

This doesn't mean you have to become a zen master overnight. Small, consistent steps can make a big difference. Start by identifying the sources of stress in your life. It could be work, relationships, or even the pressure of dealing with PCOS itself.

It's not about eliminating stress entirely - that's impossible. But by learning to manage your stress, you can improve your overall wellbeing and potentially improve your fertility as well.


In this section, we aim to address some of the frequently asked questions about NAC and its impact on PCOS, providing you with a deeper understanding of this potential treatment option.

Common Questions about NAC and PCOS

  1. What is N-Acetyl Cysteine (NAC)? NAC is a powerful antioxidant supplement known for its immune-boosting properties. It has been used for decades in Europe, particularly as a treatment for bronchitis.

  2. How does NAC help women with PCOS? NAC has shown promising results in boosting fertility, improving insulin resistance, restoring hormone balance, fighting inflammation, and aiding liver function in women with PCOS.

  3. Can NAC help me get pregnant if I have PCOS? Research suggests that women with PCOS who take NAC have higher odds of getting pregnant compared to those who take a placebo. However, more well-designed randomized controlled trials are needed to confirm these findings.

  4. Is NAC safe to use? Overall, NAC is a well-tolerated dietary supplement. However, it's always recommended to consult with your healthcare provider and registered dietitian nutritionist before starting any new supplement.

  5. How does NAC compare to other treatments for PCOS? While NAC has shown significant improvement in pregnancy and ovulation rates compared to placebo, it was less likely to result in pregnancy or ovulation compared to metformin.

  6. What is the recommended dose of NAC for PCOS? The appropriate dose of NAC can vary depending on individual circumstances. It's best to consult with your healthcare provider for personalised advice.

Resources for Further Reading

In this section, we've compiled a list of websites that can provide you with a more in-depth understanding of this topic and expand your knowledge on N-Acetyl Cysteine (NAC) and its potential benefits for PCOS. 

  • Verywell Health: This site provides a wealth of information on NAC supplements and their benefits. It also offers a comprehensive guide on the different types of drugs used to treat PCOS.
  • PubMed: A reliable source for numerous research papers on NAC and its impact on PCOS. You can use the search function to find specific studies related to your interest.
  • NCBI Literature Resources: This is a great place to find more in-depth scientific literature about NAC and PCOS.
  • MedlinePlus Health Information: This site provides a wide range of health information, including details on NAC and its potential benefits for women with PCOS.
  • De Gruyter: An online publisher that offers a variety of scientific and academic books and journals. You might find some valuable resources on NAC and PCOS here.
  • INNOBIO Corporation Limited: They provide content on nutritional value optimization, which could be beneficial for women with PCOS.

Final Thoughts on NAC and Fertility in PCOS

In conclusion, N-Acetyl Cysteine (NAC) is a promising supplement for women with PCOS, offering potential benefits in fertility, hormonal balance, and metabolic health. It's crucial to remember that while NAC can be a powerful tool in managing PCOS, it should only be used as part of a comprehensive approach that includes diet, exercise, and other lifestyle modifications. Always consult with your doctor, a registered dietitian or nutritionist before starting any new supplement regimen. The journey with PCOS can be challenging, but with the right tools and support, it's possible to manage symptoms and improve fertility. The future of PCOS and fertility treatment is promising, with ongoing research and emerging treatments paving the way for better outcomes.

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