Inositols Decrease Gestational Diabetes in PCOS Women

Many of you may be familiar with inositols and their potential benefits for women with PCOS.  But, did you know that inositols may also decrease your risk of gestational diabetes? Having optimal inositol levels is very important for women who are pregnant or are trying to conceive. Women with PCOS are 2 ½ to 3 ½ times more likely to develop gestational diabetes than pregnant women without PCOS.1-2

In this article, we review the basics of gestational diabetes and explain how women with PCOS may decrease their risk by taking an inositol supplement.

What is gestational diabetes?

Put simply, gestational diabetes is diabetes during pregnancy. Women who have never had diabetes can develop gestational diabetes during pregnancy because hormones that are produced by the placenta to help the baby grow also increase insulin resistance in the mom.  In other words, these placental hormones keep the mother from responding to insulin efficiently and change the way she metabolizes carbohydrates and fats, which can result in high blood sugar levels.

Most women will make enough insulin to keep their blood sugar levels from getting too high during pregnancy.  When your body does not make enough insulin, or is too resistant to insulin, however, gestational diabetes results.

Screening for gestational diabetes is usually done between 24-28 weeks pregnant. If you have PCOS, your doctor may recommend that you get screened earlier in pregnancy, and if negative, screened again during the typical 24-28 week period.  An oral glucose tolerance test is done for women who fail the screening.  During this test, a woman will have to consume a sugary drink within 5 minutes. A blood draw is done prior to drinking the sugary drink, and repeated at 1, 2, and 3 hours after. Results of this blood test reveal whether you have gestational diabetes.

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Who is at an increased risk for gestational diabetes?

Because many women with PCOS are already insulin resistant before pregnancy, they are at a higher risk for gestational diabetes.  Additional factors that may increase the chance of having gestational diabetes include:

  • family history (parent or sibling with type 2 diabetes) or personal history (prediabetes or slightly high blood sugar prior to pregnancy)
  • older maternal age
  • Body mass index (BMI) > 35
  • excessive weight gain during pregnancy
  • gestational diabetes during a previous pregnancy
  • previously given birth to a baby over 9 pounds

How is gestational diabetes treated?

Gestational diabetes can lead to problems for mother and baby if blood sugar levels are not controlled.

Women are advised to make diet and lifestyle changes when diagnosed with gestational diabetes.  A doctor may also prescribe medication when diet and lifestyle changes are not enough to control blood sugar levels.

In addition to diet and lifestyle changes and prescription medications, recent research suggests that inositols may reduce the risk of gestational diabetes.

What are inositols?

Inositol is a nutrient found in fruits, beans, grains and nuts, and also produced by the body. The two forms that have shown benefit for women with PCOS are myo-inositol and D-chiro-inositol.  Research has shown that these inositols decrease insulin resistance, reduce testosterone levels, regulate menstrual cycles, and promote ovulation and fertility.3-5

Myo-inositol and D-chiro-inositol are thought to be out of balance in women with PCOS.  Taking a combination of these two forms, in the body’s naturally occurring ratio of 40 to 1, helps correct this imbalance.

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How do inositols work?

Inositols work by helping the body use insulin more effectively.  They are considered “secondary messengers” in insulin signaling.  Insulin is a hormone made by the pancreas that allows our cells to take in glucose and produce energy from the food we eat.  For insulin to work, it must bind to the insulin receptor on the surface of our cells.

Think of a lock (the insulin receptor) and a key (insulin).  When insulin binds to its receptor, it “unlocks” and releases secondary messengers.  These secondary messengers tell the cell it is time to take in glucose from the blood.

Most women with PCOS are insulin resistant and do not properly release secondary messengers (such as inositol).  As a result, glucose does not get into the cell efficiently, and blood sugar levels remain high.  This tells the pancreas to make more insulin.  The over-production of insulin results in high insulin and blood sugar levels.

Taking an inositol supplement that has both myo- and D-chiro-inositol in the ideal 40 to 1 ratio helps with insulin signaling, and thereby decreases insulin resistance.  This results in lower insulin and blood sugar levels.

Inositols and gestational diabetes: what does the research show?

Numerous studies have found that inositols decrease the risk of gestational diabetes.

A study of women with PCOS found that only 17% of those who took myo-inositol throughout pregnancy developed gestational diabetes (compared to 54% of those who did not take inositol).6  Studies also found that myo-inositol decreased the risk of gestational diabetes by 50-67% among women with a family history of type 2 diabetes, as well as among women who were overweight and obese.7-9

Other research showed a decreased risk of gestational diabetes with inositol among women who had elevated fasting blood sugar levels during early pregnancy.  Women taking inositol also had lower rates of preterm delivery and gave birth to smaller babies with fewer episodes of low blood sugar.10

In another study,  a combination of myo-inositol, D-chiro-inositol, and other nutrients decreased the risk of gestational diabetes among women with elevated first trimester fasting blood sugar levels.11

This research adds to the growing number of inositol studies showing positive results in women with PCOS.  Potentially decreasing gestational diabetes risk is just one of many reasons to add an inositol supplement to your daily regimen.

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How much inositol should I take?

According to these studies, women should take 2000 mg of myo-inositol, twice a day.  Ideally, an inositol supplement should also contain D-chiro-inositol.  A supplement that combines myo- and D-chiro-inositol, in a 40 to 1 ratio, is ideal.

Are inositols safe during pregnancy?

Yes, inositols are safe to take during pregnancy.  The studies mentioned above have not shown any significant adverse effects in pregnant women. As always, consult with your doctor before taking any dietary supplement.

About the Author

Tiffany GrahamTiffany Graham, MPH, RDN, LDN is a Registered Dietitian and the Vice President for Research and Education at Theralogix Nutritional Science.  Theralogix produces evidenced based, independently tested and certified nutritional supplements for women’s health and other medical specialties.

Tiffany is passionate about the role of nutrition and supplementation for women’s health.  Her primary interests include PCOS, fertility and pregnancy.  Tiffany’s interest in gestational diabetes began when she herself was diagnosed.  Her personal struggle to manage her blood sugar levels, which became more difficult as her pregnancy progressed, gave her a true appreciation of the role nutrition and inositol supplementation in insulin and blood sugar control.

Tiffany resides in the Washington, DC area, where she enjoys cooking, running and other outdoor activities with her husband and two sons.


  1. Yu et al. Association between polycystic ovary syndrome and the risk of pregnancy complications: A PRISMA-compliant systematic review and meta-analysis. Medicine (Baltimore). 2016; 95(51):e4863.
  2. Qin et al. Obstetric complications in women with polycystic ovary syndrome: a systematic review and meta-analysis. Reprod Biol Endocrinol. 2013; 11:56.
  3. Artini et al. Endocrine and clinical effects of myo-inositol administration in polycystic ovary syndrome. A randomized study. Gynecol Endocrinol. 2013; 29(4):275-9.4. Benelli et al. A Combined Therapy with Myo-Inositol and D-Chiro-Inositol Improves Endocrine Parameters and Insulin Resistance in PCOS Young Overweight Women. Int J Endocrinol. 2016:3204083.
  4. Constantino et al. Metabolic and hormonal effects of myo-inositol in women with polycystic ovary syndrome: a double-blind trial. Eur Rev Med Phamacol Sci. 2009; 13:105-10.
  5. D’Anna et al. Myo-inositol may prevent gestational diabetes in PCOS women. Gynecol Endocrinol. 2012; 28(6):440-2.
  6. D’Anna et al. Myo-Inositol supplementation and onset of gestational diabetes mellitus in pregnant women with a family history of type 2 diabetes: a prospective, randomized, placebo-controlled study. Diabetes Care. 2013; 36(4):854-7.
  7. Santamaria et al. Myo-inositol may prevent gestational diabetes onset in overweight women: a randomized, controlled trial. J Matern Fetal Neonatal Med. 2016; 29(19):3234-7.
  8. D’Anna et al. Myo-inositol Supplementation for Prevention of Gestational Diabetes in Obese Pregnant Women: A Randomized Controlled Trial. Obstet Gynecol. 2015;126(2):310-5.
  9. Matarrelli et al. Effect of dietary myo-inositol supplementation in pregnancy on the incidence of maternal gestational diabetes mellitus and fetal outcomes: a randomized controlled trial. J Matern Fetal Neonatal Med. 2013;26(10):967-72.
  10. Dell’ Edera et al. The influence of D-chiro-inositol and D-myo-inositol in pregnant women with glucose intolerance. Biomed Rep. 2017; 7(2):169-172.
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Comments (17)
  • Anne

    March 7, 2018 at 3:28 pm

    There is no more references than 5 and you mention in the article number 6 and so on. 🙂 Would you be able to share the references mentioned in the article?

  • Angela Grassi

    March 8, 2018 at 8:23 pm

    Yes, thank you for alerting us to this! They have been added.

  • Rakshita Agrawal

    March 23, 2018 at 8:45 am

    Interesting blog, good information given related to diabetes in pcos women. Thanks for sharing the blog with us.

  • Cate

    May 30, 2018 at 2:11 pm

    Maybe you addressed this and I missed it, but can I take Ovasitol and berberine at the same time?

  • Angela Grassi

    May 30, 2018 at 2:12 pm

    yes, you can take ovasitol and berberine at the same time.

  • Mina

    September 14, 2018 at 1:59 am


    Does taking 2000 mg if myo-inositol and 50 mg of d-chiro pose any particular risk during pregnancy? Does it cause uterine cramping or any other adverse affects? I have PCOS and have had great results taking both. I’m unsure if I should continue now that I’m 4 weeks pregnant. Your article is informative as it relates to gestational diabetes. I would like to know if there are any potential downsides to taking these supplements while pregnant. Thank you.

  • Angela Grassi

    September 14, 2018 at 8:26 am

    No adverse risks of taking Ovasitol in pregnancy have been found, however, we need more studies. Please consult with your doctor about taking Ovasitol or any supplement during pregnancy.


  • Linda

    January 2, 2019 at 3:46 pm

    Hello Angela, does it have any contraindications with hypertension medication Adalat? I have recently been diagnosed with PCOS and menses have been all over the place.
    Thank you

  • Angela Grassi

    January 23, 2019 at 5:24 pm

    No, I am not aware of any contraindications

  • Sarah Sonntag

    December 27, 2019 at 5:23 pm

    I’m worried about taking metformin and Ovasitol together. My doctor hasn’t heard of Ovasitol so asking him might not be the best route. I’m so confused what to do.

  • Angela Grassi

    December 28, 2019 at 2:25 pm

    Sarah you can take metformin and Ovasitol together. Ovasitol contains inositol, a b-vitamin. Maybe if you bring in the research your doctor would be able to advise better?

  • leah pombo

    May 7, 2020 at 7:21 am

    I am an OB GYN, NP. I use Ovasitol for regulating PCOS all of the time, and I personally used it throughout my pregnancy as well. Do you have any studies that show how long you can safely take this through pregnancy? I felt comfortable taking it the entire time, but I want to know that it’s okay to tell my patients this. One of the doctors that I work with seems to disagree and wants our patients to stop between 10-12 weeks like Metformin.

  • Angela Grassi

    May 7, 2020 at 10:33 am

    Hi Leah,
    I am not aware of any studies off hand but I will connect you with a dietitian at Theralogix who took Ovasitol throughout her pregnancy and has done research on this.

  • Paige Richards

    June 7, 2020 at 1:46 pm

    Hello, you responded to Leah preciously;

    “Hi Leah,
    I am not aware of any studies off hand but I will connect you with a dietitian at Theralogix who took Ovasitol throughout her pregnancy and has done research on this.”

    I’m in the same boat, and have no information that. I can find, can I be in contact with this person as well? I would love to just hear from someone who has used this through pregnancy as well. My doctor’s don’t know much about it so I’m just on my own trying to decide to continue taking it or not.

    Thank you.

  • Angela Grassi

    June 8, 2020 at 10:28 am

    Sure! Please email us so we can connect you.

  • Andreina

    August 13, 2021 at 12:12 am

    I am 32 weeks pregnant with GDM and my doctor advise to go on metformin but the side effects are just as bad as the first trimester. I am taking Ovasitol but my doctor says she does not recommend it as she does not know anything about it. Can this product affect me or the baby in any way?

  • Angela Grassi

    August 16, 2021 at 7:33 am

    Inositols have been studied in pregnancy and shown to help reduce the risk for getting gestational diabetes. Because you have GDM, I would refer to your doctor. Here is some research if you want to share with her:

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