Searching online for PCOS supplements can be overwhelming. With so many products or influencers promising hormone balance, better cycles, or instant results, it’s hard to know what actually works.
At Ignite Nutrition, our registered dietitians take an evidence-based and practical approach to PCOS management. The truth is that supplements can play a helpful role in managing PCOS, but they aren’t a cure or a quick fix. Supplements work best when paired with the foundations of PCOS care: nutrition, lifestyle, and medical support. You can learn more about improving insulin resistance and lifestyle strategies in our post on managing insulin resistance in PCOS.
In this post, we’ll cover the top 5 supplements for PCOS and we’re not just pulling these out of thin air. These are supplements that research shows can make a real difference for women with PCOS. My hope is that this post will help you decide which ones might be right for you.
Table of Contents
Vitamin D
Low vitamin D is common around the world, and many women with PCOS have low levels too, especially if they live in a northern climate like Canada. Some studies show women with PCOS have lower vitamin D than those without it, while others don’t see a big difference. At this point, we don’t know the exact reason why women with PCOS tend to have lower vitamin D levels. However, there are several theories. It is likely related to a mix of factors, including higher body fat, insulin resistance, inflammation, and genetics.
How Vitamin D May Help Manage PCOS
When vitamin D levels are low, it can make many PCOS symptoms worse. Vitamin D plays a crucial role in how your body uses insulin, regulates hormone levels, and supports fertility. Low levels can worsen insulin resistance and hormonal imbalance, which worsen PCOS symptoms and co-morbidities.
Early research suggests that improving vitamin D levels may help with insulin sensitivity, menstrual regularity, and even mood; however, more studies are required to confirm the optimal dose and long-term benefits.
Taking Vitamin D
The recommended daily amount of vitamin D for adults is 400 IU; however, most supplements come in a 1000 IU tablet or liquid drops, which is a typical and safe dose for most people. It is best to take your vitamin D with a meal or snack that includes some fat, as this helps your body absorb it more effectively.
Remember, more isn’t always better! Since vitamin D is fat-soluble, your body stores any extra in fat cells, and taking too much can increase the risk of toxicity if you take above the recommended amounts unless advised by your doctor.
Omega-3 Fatty Acids
If you’ve heard about omega-3s, it is likely for heart or brain health. Still, they also play an essential role in hormone balance, inflammation, and insulin resistance, which makes them especially relevant for PCOS.
Omega-3 fats are a type of healthy polyunsaturated fat that helps reduce inflammation in the body. The three main types are:
- ALA (alpha-linolenic acid)
- EPA (eicosapentaenoic acid)
- DHA (docosahexaenoic acid).
Because our bodies can only convert a small amount of ALA into EPA and DHA, it’s vital to get these directly from food or supplements.
Similar to vitamin D, a connection has been found between low levels of omega-3 fatty acids in the blood and women with PCOS. It’s not yet clear whether this is a cause or simply a correlation. However, researchers believe that low omega-3 levels may contribute to insulin resistance and inflammation, which increase the severity of PCOS symptoms.
How Omega-3s May Help Manage PCOS
Research indicates that omega-3 fatty acids, particularly those found in fish, can enhance the body’s response to insulin, which may lower fasting insulin levels and support more stable blood sugar levels and overall metabolic health.
Omega-3s may help lower testosterone (which is often raised in PCOS) and increase sex hormone–binding globulin (SHBG), a protein that binds excess hormones. Improving hormonal balance can support more regular menstrual cycles and help reduce symptoms like acne, unwanted hair growth, or hair thinning.
Another key benefit of omega-3s is their anti-inflammatory effect. They can lower inflammation markers, such as CRP, and boost adiponectin. This hormone helps the body improve its insulin use. Early research suggests omega-3s may also reduce inflammation in the gut and ovaries, which may help improve hormone regulation and ovulation over time. For more information on omega-3s for gut health, check out our other article.
Where to Get Omega-3s
Whenever possible, it’s best to get your omega-3s from food first.
- EPA & DHA sources: Salmon, trout, sardines, mackerel, herring, Arctic char, and eggs that are enriched with omega-3s.
- ALA sources: Walnuts, flaxseed, chia seeds, hemp seeds, canola oil, and soy products.
If you’re unable to meet your nutritional needs solely through food, a high-quality supplement can help. Look for one that provides at least 600 mg of combined EPA and DHA per day. Some omega-3 supplements also include vitamin D, which can enhance the absorption of vitamin D while reducing the number of pills you need to take.
When reading labels, check that the omega-3 amount listed refers to total EPA and DHA combined, not just the total “omega-3s” or “fish oil”. Most people do well with 600–1,000 mg per day; however, if you take blood-thinning medication, consult your doctor or pharmacist first, as high doses may increase the risk of bleeding.
Inositol
Inositols are vitamin-like compounds that help the body utilize insulin and regulate hormone levels. The two main types are myo-inositol (MI) and D-chiro-inositol (DCI). Both occur naturally in the ovaries and play a role in insulin signaling and egg development.
Women without PCOS usually have a ratio of about 100:1 MI to DCI in their ovaries. In PCOS, this ratio is often reversed, where women with PCOS have less MI and too much DCI, which can interfere with ovulation and increase testosterone levels.
How Inositol May Help Manage PCOS
Research on inositol supplements shows mixed results. A meta-analysis that informed the 2023 International PCOS Guidelines compared inositol with metformin, hormonal contraceptives, and a placebo. Metformin is a medication that helps balance blood sugar by improving insulin’s ability to move sugar into cells and lowering the amount of sugar made by the liver. Overall, metformin remains the most effective option for improving insulin resistance, waist-to-hip ratio, and symptoms associated with higher testosterone levels, such as acne and unwanted hair growth.
That said, inositol may still offer modest benefits, especially for people who prefer to try supplements first or struggle with metformin side effects. Some studies have found modest improvements in menstrual regularity, HDL (“good”) cholesterol, and hormone balance.
The takeaway? You may have heard of inositol promoted as a ‘natural alternative’ to metformin. While inositol can be helpful for some women who don’t tolerate metformin well or want to try supplements first, research shows that metformin remains the more effective option.
Taking Inositol
If you decide to try inositol, the common form is a 40:1 ratio of myo-inositol to D-chiro-inositol, usually taken as a powder mixed with water or capsules. While that combination is often marketed as the best form, the research is limited and inconsistent, but more studies are needed to confirm whether it is superior to other combinations.
It’s generally well-tolerated, although some people may experience mild digestive upset at higher doses.
If you’re taking medications such as metformin, insulin, or GLP-1s, it’s a good idea to monitor for signs of low blood sugar, as inositol may enhance insulin sensitivity.
In my experience, women with PCOS phenotype D, those who don’t have insulin resistance or elevated testosterone, tend to see fewer benefits from inositol supplements. While there isn’t research yet looking specifically at PCOS phenotypes and supplement response, the few clients I’ve worked with who had negative reactions to inositol all fell into this group.
Berberine
Berberine is a plant compound that’s been used in traditional medicine and is now being studied for its potential role in managing insulin resistance and hormone balance in PCOS. While it’s sometimes compared to metformin, the research shows that it doesn’t work better and may only have similar short-term effects. Because studies to date have been small and vary in design and dosage, further research is needed to understand its benefits and safety fully.
That said, berberine may be a helpful option for those who don’t tolerate metformin or who want to try a supplement approach alongside nutrition and lifestyle changes.
How Berberine May Help PCOS
Berberine may help the body use insulin more effectively and support better blood sugar control. Its effects appear similar to those of metformin, though not as strong. Studies show berberine can lower total and LDL (“bad”) cholesterol and raise HDL (“good”) cholesterol, supporting overall metabolic health. Some small studies suggest that berberine may improve ovulation and pregnancy rates; however, more research is needed to confirm these effects. Berberine may lower testosterone and increase SHBG, which can help reduce symptoms like acne or unwanted hair growth, though results do not outperform medications.
That’s a lot of ‘may help with’ statements – ultimately, we still have a lot to learn and it’s not the supplement with the most evidence for PCOS at this point.
Taking Berberine
Most studies have used doses of 500 mg two to three times daily (up to about 1,500 mg per day) for 8-12 weeks.
Berberine is generally well-tolerated but may cause digestive side effects, such as mild constipation or an upset stomach. Berberine may interact with medications such as metformin, antibiotics, and antidepressants; it’s best used under medical supervision. Additionally, it’s not recommended during pregnancy or breastfeeding. More research is still needed to confirm its long-term safety, best dosing, and who benefits most.
N-Acetylcysteine (NAC)
N-Acetylcysteine (NAC) is an antioxidant and amino acid derivative that helps your body make glutathione, a compound that reduces oxidative stress and supports insulin function.
How NAC May Help Manage PCOS
Some research shows that NAC can improve ovulation, pregnancy, and live birth rates, especially when combined with fertility medications like Clomid or letrozole. Other studies have found similar results to metformin, with no significant differences. While NAC looks promising, it’s not a guaranteed fertility booster. NAC may help the body respond better to insulin, lower cholesterol, and reduce oxidative stress, which supports overall hormone balance. However, results are mixed, and it doesn’t consistently outperform medication like metformin – are we seeing a theme here?
Taking NAC
Most studies use 1,200–1,800 mg per day, often in divided doses or on days 3-7 of the menstrual cycle when used for fertility support.
NAC is generally well-tolerated and considered safe for most adults; however, mild digestive upset can occur at higher doses. NAC should be used with caution if you have a history of ulcers, asthma, or liver or kidney conditions. Research on NAC during pregnancy or breastfeeding is limited, and it may interact with nitroglycerin or anticoagulant medications. NAC is best taken under the guidance of a medical professional.
Conclusion
Supplements can play a supportive role in managing PCOS. Still, they are not miracle pills as some influencers or companies may imply. The best results come from a personalized approach that begins with a solid foundation in nutrition, movement, and lifestyle, complemented by guidance from your healthcare team.
While supplements like inositol, NAC, and berberine may help alleviate insulin resistance, hormone imbalance, and inflammation, research indicates that they aren’t more effective or safer than medications such as metformin or birth control. Due to government medication price controls in Canada and health benefits, supplements are not always cheaper than medications.
At Ignite Nutrition, we help PCOS patients develop safe, evidence-based supplement strategies that complement their medical care and fit their unique needs. Managing PCOS is most effective when it’s personalized.
Categorized: Women's Health
