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Managing PCOS with Inositol: 13 Expert Tips (Complete Guide)

Kym Campbell

By Kym Campbell, BSc. | Updated March 18th, 2024
Medically Reviewed by Dr. Sarah Lee, M.D & Dr. Jessica A McCoy, Ph.D

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Key Takeaways

Myo-inositol can enhance fertility and reduce pregnancy risks for women with PCOS. It can also help with acne and hirsutism for some people. Weight loss benefits are small at best.

Inositol is a good alternative to Metformin.

In most cases, it’s ill-advised to take D-chiro-inositol in isolation. 40:1 combined inositol formulations are considered superior.

For best results combine inositol with a PCOS-friendly diet. Get started with this free 3-Day Meal Plan or join my free 30-Day PCOS Diet Challenge.

For inositol recommendations tailored to your health goals, take this PCOS inositol quiz.

There’s no such thing as a supplement for PCOS, but inositol may be the next best thing. This article tells you what you need to know about these medicines.

For product recommendations and dosages based on your specific health goals, take this PCOS inositol quiz.

What Is Inositol?

Inositols are a family of naturally occurring, vitamin-like compounds found in many foods. They play a vital role in many key aspects of health and fertility.

The first controlled trial of inositols for PCOS was published in 1999 [1]. Since then, there’s been great interest in two particular forms of inositol: myo-inositol, and D-chiro-inositol. Imbalances in these inositols cause insulin resistance in women with PCOS. They may also account for the sex hormone imbalances that characterize this syndrome [2-4].

How Much Inositol for PCOS

Typical inositol PCOS dosage:

  • Myo-inositol: 4,000 mg/day taken in two doses.
  • D-chiro-inositol: 600 – 1000 mg per day [5, 6].
  • Combined Myo and D-chiro inositol: 4000 mg/day of myo-inositol + 100 mg/day of D-chiro inositol taken in two doses.

See point #12 for safety information.

1. Food is a Good Source of Inositol… But Not for PCOS

Phytic acid is the main source of dietary inositol. Some of the best high-inositol foods for women with PCOS include [7]:

  • Grains: Amaranth, buckwheat, wild rice, and popcorn.
  • Legumes: Beans, chickpeas, and lentils.
  • Nuts: Almonds, cashews, macadamia, walnuts, and pecans.
  • Seeds: Flaxseeds, sunflower seeds, and sesame seeds.

I use these ingredients in a lot of my PCOS recipes. Many also feature in my free 30-Day PCOS Diet Challenge and free 3-Day Meal Plan.

Studies show that it’s possible to get enough inositol from diet alone [7, 8]. But these diets are too high in carbohydrates for women with PCOS. Getting the right balance of macronutrients is a fundamental aspect of managing PCOS. That’s why inositol dietary supplements make a lot of sense.

2. It Improves Insulin Sensitivity & Blood Sugar Regulation

Insulin resistance is one of the underlying causes of PCOS [9, 10]. It’s also the primary reason that PCOS is associated with metabolic syndrome and several chronic diseases [11, 12]. Insulin resistance occurs when your cells stop responding properly to insulin. This drives insulin levels up and impacts blood sugar regulation.

Myo-inositol and D-chiro-inositol improve insulin sensitivity [13]. They do this by altering insulin signaling which plays a key role in glucose metabolism. Increased insulin sensitivity allows cells to use insulin more efficiently. This means insulin levels remain within healthier ranges helping to reverse insulin resistance.

Over time, inositol therapy results in better hormone balance for all types of PCOS [5, 6, 14].

3. Myo-Inositol Can Enhance Fertility

Large reviews of the scientific literature show uncertainty that inositol improves fertility [15, 16]. But smaller studies done on PCOS women show promising results. Myo-inositol has been shown to:

  • Improve ovarian function [17].
  • Increase egg quality [18, 19].
  • Increase the yield of mature eggs during IVF [20].
  • Increase pregnancy rates during IVF [21, 22].
  • Reduce the risk of ovarian hyperstimulation syndrome [19].
  • Be more effective than birth control at regulating ovarian function [23].
  • Be better than metformin for boosting pregnancy rates [24].

In one study, overweight women with PCOS were given myo-inositol and folic acid during IVF. Pregnancy rates were nearly three times higher compared to women who only received folic acid. [22].

Researchers looking at women undergoing intrauterine insemination (IUI) had similar results. Pregnancy rates were roughly doubled after taking myo-inositol for 3 months [25].

4. Inositol Can Prevent Gestational Diabetes

Gestational diabetes is a common problem within the PCOS community. This is where women who didn’t previously have diabetes, start having high blood sugar levels during pregnancy. Gestational diabetes is a serious condition. It increases the risk of several health complications both for the mother and for the baby.

Studies show that inositol supplements can reduce these risks [26, 27]. It’s often prescribed by physicians for the management of gestational diabetes.

5. Inositol Can Reduce Acne and Hirsutism

Unwanted hair and skin issues cause a lot of distress for women with PCOS [28]. But inositol can sometimes help. This is because inositol lowers androgen levels [4, 13].

Myo-inositol has shown statistically significant (but small) improvements in unwanted hair [29]. One study found that it helped about a third of women with hirsutism. More than half of the women studied also saw significant improvements in PCOS acne [30].

6. Weight Loss Benefits are Small at Best

Despite its impact on insulin, inositol is not a good weight loss supplement. Nordio and Proietti 2012 conducted a famous trial giving women with PCOS inositol supplements. This helped with fertility but made no difference to hip-to-waist ratio or BMI [31]. Other trials have found the weight loss benefits to be small at best [17, 32]. We’re talking about only 1-2 pounds on average over 6 months of supplementation.

That’s a statistically significant amount, but it’s below most people’s expectations.

PCOS weight loss is best achieved using these 15 steps.

7. It’s Better Than Metformin

Metformin for PCOS is a widely used treatment. But side effects are common [33, 34]. Metformin is also known to deplete nutrients with long-term use [35-43].

Metformin has limited use cases for PCOS. For example, the quality of evidence supporting its benefits for fertility is “low” [44]. The Endocrine Society Clinical Practice Guidelines state that it “has limited or no benefit in treating hirsutism, acne, or infertility [45].”

Many meta-analyses now show that inositol supplements are as effective as metformin for a range of biomarkers. These include insulin sensitization, testosterone levels, body mass index, and menstrual frequency [46, 47].

A combined therapy of myo-inositol and d-chiro-inositol shows the most promise for fertility. For example, a 2021 meta-analysis compared inositol supplements to metformin. This study showed that a combined inositol supplement was many times more effective than metformin at improving menstrual frequency [46].

8. D-Chiro-Inositol Has Limited Use in Polycystic Ovary Syndrome

When selecting products, the first decision is what type of inositol you want to take. You have three choices:

  1. Taking D-chiro-inositol alone.
  2. Taking Myo-inositol alone.
  3. Take a combination of myo-inositol and D-chiro-inositol.

Taking D-chiro-inositol alone is best left to women that have a BMI > 30, and who also have close relatives that are diabetic [48]. In most other cases, you’re better off taking myo-inositol.

9. A 40:1 Blended Supplement is Best for PCOS

Taking myo-inositol alone is the cheapest way to supplement inositol. The benefits of myo-inositol alone are well-proven, especially for fertility.

But the best inositol supplement for PCOS contains both myo-inositol and D-chiro-inositol. Studies show that a mixture of 40 parts myo-inositol to 1-part D-chiro-inositol is more effective than other formulations [49]. 40:1 is the physiological ratio that these two inositol isomers are found in the body.

During the 2010s the exact ideal ratio was the subject of debate [50]. But this question now seems to be settled. It’s why I’ve changed my tune when it comes to Ovasitol for PCOS.

The superiority of a 40:1 inositol combined supplement has been demonstrated in mouse models of PCOS [51]. It’s also been proven in PCOS patients seeking to restore ovulation [52]. Increasing the relative amounts of D-chiro inositol above 40:1 appears to reduce effectiveness and may have a negative effect.

Take my PCOS inositol quiz to find out if a 40:1 ratio is best for you.

10. Ovasitol is the Best 40:1 Ratio Brand for PCOS

Ovasitol by Theralogix is the market-leading inositol supplement for women with PCOS. And for good reason. Ovasitol contains myo-inositol and D-chiro-inositol in a 40:1 ratio. As described above, this is the most effective formulation for the treatment of PCOS.

Ovasitol is made to the highest nutraceutical standards and is free from unnecessary ingredients. It’s recommended that you take one individual packet or a scoop of Ovasitol powder twice a day. Each of these doses contains 2000 mg of myo-inositol and 50 mg D-chiro inositol.

11. Buy Only Pure Myo-Inositol Products

If you’re not buying Ovasitol, then it’s best to buy only pure myo-inositol. Jarrow Formulas is a well-priced and reliable brand. Pure Encapsulations also make a top-quality myo-inositol product.

The recommended dosage of myo-inositol is 4000 mg/day taken in two doses. That’s equal to about 1 tsp twice a day.

It’s important to be wary of products that include sweeteners, vitamins, and other ingredients. The addition of these other ingredients amounts to a “marketing maneuver” and may inhibit gut absorption [53].

The addition of folic acid to inositol supplements should be viewed with particular caution. Several recent studies have associated PCOS with MTHFR gene mutations [54, 55]. For these women, taking folic acid during pregnancy can affect childhood lung function [56]. Supplementing with methyl folate, the active form of folate is generally advised for PCOS patients instead of folic acid [57].

This is one of the reasons I prefer Theralogix preconception vitamins.

12. Safety Guidelines for Inositol Supplementation

Myo-inositol is a safe supplement. High doses have been used in trials exploring the potential for inositol supplements to treat panic disorders [58]. Inositol supplements are safe to take during your period and throughout pregnancy. No adverse effects were found in many studies that looked at normal doses taken during pregnancy [59, 60].

D-chiro-inositol alone should be approached more cautiously. High dosages may adversely affect egg quality [61].

Combination products like Ovasitol are safe to take during pregnancy and breastfeeding. There are no expected side effects.

The biggest thing to be aware of when taking inositol is its impact on blood glucose levels. Because they have a similar effect as metformin, people that are taking this drug may need to reduce their dose.

13. How Diet Enhances Inositol Benefits

The benefits of inositol supplementation derive from their ability to improve insulin sensitivity. To get the most out of this intervention though, it’s important to also change how you eat. Especially if weight loss is one of your goals.

On average, 6 months of inositol supplementation results in 1-2 pounds of weight loss [17, 32]. We frequently see weight loss of 5-10 pounds within the short period of my free 30-Day PCOS Diet Challenge. Some past participants have gone on to sustain over 100 pounds of weight loss for many years following this event.

For a sample of the meal plans issued during the Challenge, download this free 3-Day Meal Plan.

In my experience, both personally and as a health coach, no supplement can compete with a PCOS diet for efficacy.

A PCOS diet improves insulin sensitivity by reducing inflammation. You can achieve this by avoiding certain foods like sugar, gluten, and dairy. A PCOS diet also takes a direct approach to insulin regulation through a better balance of macronutrients.

The Bottom Line

Both myo-inositol and D-chiro-inositol can be good for women with PCOS. Especially when combined in a 40:1 ratio. These compounds can correct the hormone imbalances that characterize this syndrome.

Inositol supplements are safe when used as directed. They can improve metabolic health, fertility, skin, and hair. Inositol supplements alter insulin sensitivity. Because of this, they’re most effective when also following a PCOS diet.

For personalized inositol recommendations, click here to take my PCOS inositol quiz.

FAQ

Does inositol cause weight loss with PCOS? Myo-inositol may cause weight loss, but the strength of the effect is small. The most promising trials to date show only 1-2 pounds of weight loss on average over 6 months of supplementation [17, 32].

How do you explain all the inositol PCOS weight loss success stories out there? Any meaningful weight loss achieved after taking inositol supplements is likely to be the result of other factors. This is clear from the randomized controlled trials that have studied this question. Many women will undertake diet and lifestyle changes when supplementing with inositol. These interventions are more likely to drive weight loss than inositol alone.

What’s the difference between Ovasitol and inositol? Inositol is a general name for a family of nutrients. But most people use this term to refer to myo-inositol. Ovasitol is a brand-name inositol supplement. It contains a specific formulation of 40 parts myo-inositol to 1 part D-chiro-inositol.

How long does it take for inositol to work for PCOS? Studies show that the benefits of inositol supplements can be seen within 3 months. But greater benefits are seen after 6 months of treatment [31].

What is the best myo-inositol supplement for fertility? Myo-inositol is a commodity supplement. Most brands should be capable of delivering similar clinical results. But independent studies have observed significant issues with product quality and labeling accuracy [62]. It’s advised to only use trusted suppliers like those mentioned above.

Can I take myo-inositol during my period? Yes. Myo-inositol should be taken daily for the duration of treatment. It is suitable to use during your period.

When is the best time to take inositol for PCOS? Inositol is best taken when making changes to your diet and lifestyle. This helps further improve insulin regulation and hormone balance. The best time of day to take inositol is following the first and last meal of the day. It’s recommended to take inositol in two doses, at least six hours apart.

What are the most common Inositol PCOS side effects? Does inositol cause diarrhea? A 2011 review investigated the safety and side effects of myo-inositol. Only the highest dose of myo-inositol (12 g/day) induced mild gastrointestinal side effects. This included things like nausea, flatus, and diarrhea. The severity of side effects did not increase with the dosage [63]. The rates used for the treatment of PCOS (4 g/day) do not typically cause issues with diarrhea. But some patients experience headaches and dizziness when first starting supplementation.

What are some Ovasitol alternatives? Ovasitol is the market leader in PCOS inositol supplements. Inofolic Combi by LOLI Pharma is a suitable alternative. This product has been used in many inositol trials.

Ready to Take Action?

  • Join my free 30-Day PCOS Diet Challenge here. This is a unique program where you'll receive weekly meal plans, shopping lists, and helpful video lessons. You'll also be part of a motivated and inspiring community of like-minded women.

  • Download my free 3-Day PCOS Diet Meal Plan here. This is perfect for getting started if you aren't ready to commit to 30 days.

  • Join my PCOS Monthly Meal Planning Service here. This service includes hundreds of PCOS recipes within a pre-populated, yet customizable meal plan. It's designed to save you time and help you apply a PCOS diet.

  • Sign up for my Beat PCOS 10-Week Program. This is a comprehensive program that covers diet, PCOS-centric emotional eating, exercise, stress management, and much more. All within a support group environment. The 10-Week Program includes the same recipes and meal plan as my monthly meal planning service.

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