A growing body of research suggests that the gut microbiome may influence the hormonal and metabolic disturbances seen in PCOS. Scientists now propose that postbiotics, bioactive compounds produced by microorganisms, may one day complement existing treatments by restoring microbial balance and improving metabolic health.
Research: Therapeutic application of postbiotics in the management of polycystic ovary syndrome. Image credit: Elif Bayraktar/Shutterstock.com
Polycystic ovary syndrome (PCOS) is a common endocrine disorder in women of reproductive age that interferes with fertility and often causes menstrual irregularities. Increasing research interest has focused on possible connections with the gut microbiome. Recent reviews published in magazines ACS Nutrition investigates the role of postbiotics as a promising complementary approach to PCOS management.
Hormonal imbalances and metabolic dysfunction define PCOS
PCOS is characterized by high androgen levels in premenopausal women, often accompanied by polycystic ovarian morphology and ovulatory dysfunction. Women with PCOS often exhibit insulin resistance, which is often accompanied by acne, infertility, weight gain, and hirsutism. Both genetic and environmental factors can contribute to the development of symptoms.
Gut microbiome and PCOS
The gut microbiome is made up of all the microbial species in your intestines, including beneficial species such as Bifidobacteria and Lactobacillus, as well as potential pathogens such as: Staphylococcus and clostridium difficile.
Dysbiosis is an imbalance between beneficial and potentially pathogenic gut flora. This is associated with early childhood exposure to antibiotics and a high-fat, high-sugar diet. It is associated with multiple deleterious effects, including toxin production, infection, weakened intestinal epithelial barrier, immune dysregulation, altered serotonin levels, depressed mood, enterocolitis, obesity, and type 2 diabetes.
Women with PCOS often have dysbiosis, with fewer beneficial species but an increase in potentially pathogenic species, including changes in microbial diversity and changes in several bacterial taxa, with studies reporting increased abundance of groups such as actinobacteria and bacteria. Escherichia coli and Staphylococcus aureus. This imbalance between beneficial and harmful species can contribute to associated metabolic dysfunction and enteritis.
Why postbiotics are important
Managing PCOS includes dietary changes, exercise, medications, and supplements. These increasingly include postbiotics, bioactive compounds, and cellular components derived from inactivated microorganisms and their metabolic activity. Prebiotics are nondigestible food components that feed beneficial gut bacteria and support host health and well-being.
Preliminary studies suggest that postbiotics may improve insulin sensitivity, reduce inflammation, and improve gut microbiota composition and function. Additionally, it may lower androgen levels, enhance blood sugar control, and theoretically reduce the risk of metabolic complications such as type 2 diabetes and cardiovascular disease. All these effects may be clinically relevant to PCOS.
Mechanisms linking dysbiosis and PCOS
Poor diet quality, such as high intake of processed foods and low intake of probiotics, often plays a role in the development of dysbiosis. Lack of sleep, stress, alcohol consumption, smoking, and antibiotic use are also risk factors for this condition and are associated with decreased production of short chain fatty acids (SCFAs).
SCFAs are powerful immunomodulators and anti-inflammatory molecules. SCFAs such as butyrate are the main energy source for intestinal epithelial cells and help maintain the strength of the intestinal barrier. Reduced SCFA levels increase intestinal permeability, allowing bacteria to migrate from the intestinal lumen into the bloodstream. The authors suggest that this mechanism may partially explain reports of higher concentrations of Gram-negative bacterial endotoxins in the blood of PCOS patients. These are powerful pro-inflammatory molecules. Additionally, SCFAs are key to appetite regulation. It also increases insulin sensitivity and accelerates glucose and fat metabolism.
Therefore, in addition to inflammation, dysbiosis is also associated with insulin resistance. As a result, the insulin signaling pathway is impaired. Downstream cascade effects may result in decreased sex hormone binding globulin (SHBG) levels while increasing androgen production, contributing to increased androgen levels.
The intestinal flora also helps metabolize estrogen. Therefore, dysbiosis can affect the levels of circulating biologically active estrogens through changes in microbial metabolism. These changes may contribute to the complex hormonal imbalances associated with PCOS, including hyperandrogenism and menstrual irregularities.
Managing PCOS
Management of PCOS often includes supplementation with various vitamins, such as D, E, and B complex and omega-3 supplements, to improve overall health and insulin sensitivity while reducing inflammation.
Metformin and oral contraceptives are widely prescribed drugs. Metformin mainly improves insulin sensitivity and metabolic parameters, while oral contraceptives help regulate the menstrual cycle by reducing androgen production. Antiandrogens are also used to counteract the effects of certain specific androgens against hirsutism and acne, such as spironolactone and flutamide.
The current review focuses on the use of postbiotics as a promising complementary approach to PCOS management. Postbiotics include bioactive compounds such as SCFAs, vitamins, enzymes, and cell surface components. Their popularity stems from the suggested health benefits they offer in the absence of live microorganisms. This improves storage stability.
For example, postbiotics may increase levels of immunomodulatory and anti-inflammatory molecules, such as SCFA, that protect the intestine from immune-mediated damage, thereby improving intestinal health.
Postbiotics such as SCFAs may also help combat insulin resistance, a key component of PCOS. These may increase insulin sensitivity and improve glucose uptake by target tissues, while altering gut microbiota composition and bile acid metabolism to help regulate glucose and fat metabolism.
Some studies have shown that postbiotics can also affect the production of trimethylamine-N-oxide (TMAO) from dietary components such as choline, a metabolite associated with metabolic disorders and cardiovascular risk. Furthermore, SCFAs such as acetate and butyrate can increase the expression of adiponectin in adipose tissue, thereby improving insulin sensitivity and supporting host energy balance by promoting fat burning.
Other postbiotic compounds, including exopolysaccharides, may be particularly relevant for obese women with PCOS, as experimental studies suggest they have antioxidant and lipid-regulatory effects.
Postbiotics may influence mood and cognitive function through effects on the gut-brain axis, but evidence is limited. Postbiotics may improve PCOS symptoms by reversing the effects of dysbiosis. Their hormone-like effects act bidirectionally to modulate the host’s endocrine system and metabolism, thereby improving the composition of the gut microbiota.
Restrictions
The existing literature on postbiotics suffers from serious problems due to the lack of standardized definitions, leading to variability at every step from strain selection to final processing. This lack of consistency and reproducibility hinders regulatory oversight.
Furthermore, much of the current evidence comes from mechanistic, preclinical, or relevant microbiome intervention studies, and direct clinical evidence in women with PCOS is relatively limited. Some of the clinical studies cited in the literature focus on probiotics and synbiotics rather than postbiotics per se, focusing on the early stages of this research field.
Microbiome-based therapies could shape future PCOS treatments
This review paper suggests that postbiotics may complement accepted PCOS treatments such as metformin by increasing insulin sensitivity and reducing inflammation. Additionally, their favorable effects on the gut microbiota may make them useful as adjuncts to oral contraceptives in PCOS. These may hold great promise as personalized treatments based on an individual’s gut microbiome profile.
However, there is little direct evidence demonstrating their safety or efficacy, especially in long-term PCOS management. Their molecular mechanisms of action need to be explained, and preclinical findings require further validation in human studies. Rigorous longitudinal studies are essential to establish the role of postbiotics in PCOS and evolve evidence-based guidelines.
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Reference magazines:
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Pathak, VA, Kshirsagar, SJ, Deokhar, GS, et al. (2026). Therapeutic application of postbiotics in the management of polycystic ovary syndrome. ACS Nutrition. Toi: https://doi.org/10.1021/acsnutrsci.5c00042. https://pubs.acs.org/doi/10.1021/acsnutrsci.5c00042
