Myo-inositol During Pregnancy: What We Know
Myo-inositol (a type of inositol) is sometimes prescribed to pregnant Women or those with metabolic disorders. But what is myo-inositol? How does myo-inositol work with fertility and pregnancy? And is myo-inositol safe to take while pregnant?
The short answer: our current research shows that myo-inositol is perfectly safe for most pregnant people, and may decrease the risk for some pregnancy complications
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What is myo-inositol?
Inositol is a natural sugar with a similar molecular structure to glucose (National Center for Biotechnology Information, 2021). Myo-inositol is the type of inositol that is most found in nature.
Because of its similarity to glucose, it can imitate insulin--the hormone that helps move sugar from your blood to your cells. As a result, it helps decrease the level of sugar in your blood and can help relieve symptoms of insulin resistance in disorders such as polycystic ovarian syndrome (PCOS), gestational diabetes mellitus (GDM), and metabolic syndrome (Croze & Soulage, 2013).
The benefits of inositol to those with PCOS are not only reproductive; many of the symptoms of PCOS (such as acne and facial hair) stem from the production of androgens--male sex hormones.
Studies of inositol used for the treatment of PCOS have found a decrease in the formation of these androgens, and therefore an improvement of many different PCOS symptoms (Wojciechowska et al, 2019).
Other research has suggested that myo-inositol may be more effective for PCOS when taken in combination with another type of inositol: D-chiro-inositol (Nordio & Proietti, 2012).
You can get more myo- and D-chiro-inositol in your diet by eating fruits, beans, grains, and nuts--particularly when fresh and not frozen or canned (Clements & Darnell, 1980). It is also widely available as a dietary supplement.
What role does myo-inositol play in pregnancy?
Between 1 and 14% of pregnant people will develop gestational diabetes mellitus (GDM) or gluten intolerance that develops during pregnancy where it was not there previously (American Diabetes Association, 2004).
Those that develop GDM have a higher risk of developing diabetes after pregnancy (most often type 2, but sometimes type 1), and their child also has a higher rate of developing gluten intolerance and associated metabolic problems in late adolescence.
A Cochrane review looked at existing evidence for reducing risk of GDM. Across 3 trials with over 500 women, there was some reduction of risk of GDM in those who took myo-inositol supplementation, although further tests are needed. The review also suggested that diet and exercise might help reduce GDM when done together, as well as taking vitamin D and metformin (Griffith et al, 2020).
Myo-inositol is also being prescribed more often to people with polycystic ovarian syndrome (PCOS) who are experiencing problems with fertility. Some studies suggest myo-inositol can help PCOS patients become pregnant and decrease their risk of miscarriage; however, because of small sample sizes and other reporting issues, more tests are needed to prove whether myo-inositol can help ensure a successful pregnancy for those with PCOS (Showell et al, 2018).
Is myo-inositol safe to take during pregnancy?
Some research has suggested that at higher doses, side effects of myo-inositol might include nausea and other mild gastrointestinal problems, headaches, dizziness, and fatigue--however, these side effects typically only occur in higher doses than the recommended.
In fact, because it reduces the risk of GDM during pregnancy, and increases the success rate of pregnancies for those with PCOS.
We still need more and better research involving the role of myo-inositol in managing metabolic conditions and its role in pregnancy. However, current research suggests that myo-inositol is safe to take during pregnancy.
It might increase the chances of getting and staying pregnant for people with PCOS, and may reduce the risk of GDM in pregnant women.