If you've been researching PMOS (formerly known as PCOS), you've probably come across the word 'inositol'. So, what is the connection between inositol and PMOS?
Inositol is a naturally occurring compound that has been studied in relation to metabolic and reproductive features of PMOS. Research suggests it may have a role for some women, but the evidence is still developing, and it isn't a one-size-fits-all solution.
Here's what you need to know about inositol, the research behind it and where it may fit into a broader approach to managing PMOS.
What is Inositol?
Inositol is a naturally occurring carbohydrate found in the body and in foods including fruit, beans, whole grains and nuts. It's sometimes referred to as vitamin B8, but this is a common nickname rather than a scientific classification. Inositol isn't technically a vitamin because the body can produce it itself.
There are several forms of inositol. The two most commonly discussed in relation to PMOS are myo-inositol and D-chiro-inositol. Both are involved in cellular signalling, including pathways involved in how cells respond to insulin. This is one of the reasons researchers have been interested in exploring their potential role in PMOS.
Why is Inositol Linked to PMOS?
PMOS is a complex condition that can affect reproductive, metabolic and hormonal health in different ways.
Insulin is a hormone that helps your cells take up glucose from your bloodstream to use for energy. Insulin resistance is recognised as one of the factors involved in the development of PMOS, although not every woman with PMOS experiences it in the same way. Because inositol is involved in insulin signalling, researchers have explored whether supplementation may influence some of the metabolic and reproductive features associated with PMOS.
This doesn't mean that inositol is a treatment for PMOS as a whole. Rather, it is one area of research within a much broader condition.
What Does the Research Say about Inositol and PMOS?
Research into inositol and PMOS is growing, but the evidence isn't strong enough to say that everyone with PMOS will benefit from taking it.
The 2023 evidence-based guideline states that inositol could be considered for women with PMOS based on individual preferences and values. However, it also notes that evidence for clinical benefits is limited, particularly for outcomes such as ovulation, hirsutism and weight.
Research has explored whether inositol may influence areas including:
Metabolic Health
Because inositol is involved in insulin signalling, researchers have investigated its potential effects on metabolic measures in women with PMOS. The current guideline recognises potential improvements in some metabolic measures, but the evidence is considered limited.
Menstrual Cycles and Ovulation
Some studies have investigated whether inositol supplementation may be associated with changes in menstrual regularity and ovulation.
Fertility
Inositol is also frequently discussed in relation to fertility. However, this is an area where it's particularly important to distinguish between promising research and established evidence. The guideline considers inositol an experimental therapy for fertility in women with PMOS because the evidence around ovulation, pregnancy and live birth outcomes remains uncertain.
So, while inositol is an interesting area of research, it shouldn't be presented as a fertility treatment.
Should Everyone with PMOS take Inositol?
Whether inositol is appropriate depends on your individual circumstances, including your symptoms, medical history, medications and overall health. The guidelines recommend discussing complementary therapies with a healthcare professional and taking individual preferences into account.
If you're considering an inositol supplement, speak with your doctor, pharmacist, dietitian or another appropriately qualified healthcare professional. They can help you understand whether supplementation is appropriate for you.
Is Inositol a Replacement for Healthy Habits?
Inositol shouldn't be viewed as a replacement for the foundations of good health.
The PMOS guidelines continue to emphasise healthy lifestyle approaches, including sustainable healthy eating and physical activity, alongside individualised care. Importantly, it does not recommend one particular type of diet as being superior for everyone with PMOS. For some women, managing PMOS may involve a combination of lifestyle changes, medical treatment, supplements and regular monitoring. That said, the right approach will look different from person to person.
What Should you Look for in an Inositol Supplement?
If you've decided with a healthcare professional that an inositol supplement is appropriate for you, it's worth looking beyond the word "inositol" on the label.
Different products can contain different forms, doses and combinations of ingredients. The international guideline specifically notes that the quality, consistency and regulation of nutrient supplements can vary. This is one reason it's important to look at the full formulation rather than assuming that every inositol supplement is the same.
Understanding your Options
There's a lot of information online about PMOS, and it can be difficult to separate established evidence from claims that have got ahead of the research.
Inositol is a well-researched area of PMOS nutrition, but the current evidence is nuanced. It may have a role for some women, particularly in relation to metabolic measures, but it isn't a cure for PMOS and isn't appropriate for everyone.
The most useful approach is to think about inositol as one potential part of a personalised PMOS support plan, rather than a solution on its own.
