According to Gram Research analysis, a supplement containing myo-inositol and D-chiro-inositol in a 3.6:1 ratio plus antioxidants improved pregnancy rates in women with PCOS undergoing fertility treatment. In a study of 92 women, those taking this supplement for at least one month before treatment achieved pregnancy rates of 54.39% compared to 42.65% in women taking standard supplements, with higher fertilization rates and better embryo quality.
Women with PCOS (polycystic ovary syndrome) often struggle to get pregnant because their bodies don’t handle insulin properly, which affects egg development. Researchers tested whether a supplement containing two natural substances called myo-inositol and D-chiro-inositol in a specific 3.6:1 ratio, plus antioxidants, could help. In a study of 92 women with PCOS undergoing fertility treatment, those who took this supplement for at least one month before treatment had higher pregnancy rates and better quality eggs compared to women taking standard supplements. While these results are encouraging, larger studies are needed to confirm the findings.
Key Statistics
A 2026 cohort study of 92 women with PCOS found that taking a 3.6:1 myo-inositol to D-chiro-inositol supplement with antioxidants for one month before fertility treatment increased pregnancy rates from 42.65% to 54.39%.
Women taking the special inositol supplement in the 2026 study had fertilization rates of 77.66% compared to 71.61% in the standard supplement group, a statistically significant improvement.
In the 92-woman study, only 4.35% of cycles in the supplement group ended without a good-quality embryo available for transfer, compared to 17.39% in the standard supplement group.
The 2026 pilot study showed ongoing pregnancy rates of 45.61% in women taking the 3.6:1 myo-inositol and D-chiro-inositol supplement versus 36.76% in the standard supplement group.
The Quick Take
- What they studied: Whether a specific supplement containing two natural compounds (myo-inositol and D-chiro-inositol) taken before fertility treatment could improve pregnancy chances in women with PCOS.
- Who participated: 92 women diagnosed with PCOS who were undergoing egg retrieval for fertility treatment. The women were split into two groups: one taking the special supplement and one taking standard supplements.
- Key finding: Women taking the special supplement had pregnancy rates of 54.39% compared to 42.65% in the standard supplement group. They also had higher fertilization rates (77.66% vs. 71.61%) and were less likely to end treatment without good-quality embryos.
- What it means for you: If you have PCOS and are planning fertility treatment, this supplement may improve your chances of pregnancy. However, talk to your doctor before starting any new supplement, as this is a small pilot study and larger studies are needed to confirm these results.
The Research Details
This was a retrospective cohort study, which means researchers looked back at medical records of women who had already undergone fertility treatment. They compared two groups of women with PCOS: those who had taken a supplement containing myo-inositol and D-chiro-inositol in a 3.6:1 ratio plus antioxidants for at least one month before treatment, and those who took standard supplements. The researchers tracked what happened during their fertility treatment, including how many eggs were retrieved, how well those eggs fertilized, and whether they became pregnant.
The study focused on women with PCOS, a common condition affecting the ovaries. PCOS often causes insulin resistance, meaning the body doesn’t respond properly to insulin. This can interfere with egg development and make pregnancy harder. The researchers wanted to see if the special supplement could help by improving how the body handles insulin and protecting egg quality.
Both groups of women went through the same fertility treatment process. The main difference was what supplement they took beforehand. Researchers measured several outcomes, from the number of eggs collected to whether women became pregnant and stayed pregnant.
Understanding what supplements might help women with PCOS is important because PCOS affects about 1 in 10 women of childbearing age and is a leading cause of infertility. If a simple supplement taken before treatment could improve pregnancy chances, it could help many women. This study is valuable because it looks at a specific combination and ratio of ingredients that previous research suggested might work.
This is a pilot study with a relatively small sample size (92 women), which means the results are promising but not definitive. It’s a retrospective study, meaning researchers looked back at past records rather than following women forward in time, which can introduce some bias. The study was observational, not randomized, so the two groups might have had some differences we don’t know about. The researchers note that larger, prospective studies are needed to confirm these findings. However, the study did show statistically significant differences in pregnancy rates and fertilization rates, which strengthens the findings.
What the Results Show
The most important finding was that women taking the special supplement had significantly higher pregnancy rates. Specifically, 54.39% of women in the supplement group achieved pregnancy compared to 42.65% in the standard supplement group. Even more impressive, when looking at pregnancies that continued beyond the early weeks (ongoing pregnancies), the rates were 45.61% in the supplement group versus 36.76% in the standard group.
The supplement group also had better fertilization rates. When eggs were fertilized in the lab, 77.66% of eggs from the supplement group were successfully fertilized compared to 71.61% in the standard group. This difference was statistically significant, meaning it’s unlikely to have happened by chance.
Another important finding was that women taking the supplement were much less likely to complete their fertility cycle without having at least one good-quality embryo available for transfer. Only 4.35% of supplement group cycles had no good-quality embryos, compared to 17.39% in the standard supplement group. This is a substantial difference that could affect treatment success.
Interestingly, the two groups produced similar numbers of eggs during treatment (21.5 vs. 20.7 eggs) and had similar rates of mature eggs, suggesting the supplement didn’t just increase egg quantity but actually improved egg quality.
The study found that the supplement appeared to work by improving the quality of eggs rather than the quantity. Both groups retrieved similar numbers of eggs, but the supplement group’s eggs performed better during fertilization and development. This suggests the supplement may help protect eggs from damage or improve their ability to develop into healthy embryos. The consistent improvements across multiple measures—fertilization rates, embryo quality, and pregnancy rates—suggest the supplement has a real biological effect rather than just random variation.
Previous research has suggested that myo-inositol and D-chiro-inositol, when taken in the right ratio, may help women with PCOS by improving insulin sensitivity and supporting egg development. This study builds on that research by testing a specific 3.6:1 ratio combined with antioxidants. The findings support the idea that this combination may be beneficial, though this is one of the first studies to look at this specific formulation and ratio in the context of fertility treatment.
This study has several important limitations. First, it’s small with only 92 women, so the results need to be confirmed in larger studies. Second, it’s retrospective, meaning researchers looked back at past records, which can introduce bias. Third, it’s observational rather than randomized, so we can’t be completely sure the supplement caused the improvements—other differences between the groups might explain the results. Fourth, the study doesn’t tell us exactly how the supplement works or which ingredients are most important. Finally, the study was conducted at a single center, so results might differ in other populations or settings.
The Bottom Line
If you have PCOS and are planning fertility treatment, discuss this supplement with your fertility doctor. The evidence suggests it may improve pregnancy chances, but this is a pilot study and larger studies are needed. If your doctor agrees it’s appropriate, taking the supplement for at least one month before treatment appears to be safe and may help. However, don’t rely on the supplement alone—continue working with your fertility team on all aspects of your treatment plan.
This research is most relevant to women with PCOS who are planning to undergo fertility treatment like IVF. Women with PCOS who are trying to conceive naturally might also benefit, though this study specifically looked at fertility treatment. Women without PCOS should talk to their doctor before taking this supplement, as it’s designed for PCOS-related insulin issues. Anyone with liver problems or taking medications that affect blood sugar should check with their doctor first.
In this study, women took the supplement for at least one month before starting fertility treatment. Pregnancy results were measured after the fertility treatment cycle was complete, so the full timeline from starting the supplement to knowing if treatment worked was typically 2-3 months. If you start this supplement, you should plan to take it for at least one month before beginning fertility treatment to give it time to work.
Frequently Asked Questions
Does inositol supplement help with PCOS and fertility?
Research shows that myo-inositol and D-chiro-inositol in a 3.6:1 ratio may help women with PCOS improve fertility outcomes. A 2026 study found pregnancy rates increased from 42.65% to 54.39% when women took this supplement for one month before fertility treatment.
How long should I take inositol before IVF treatment?
In the 2026 study, women took the supplement for at least one month before starting fertility treatment and saw improved results. Your fertility doctor can recommend the best timing for your specific situation.
What is the correct ratio of myo-inositol to D-chiro-inositol?
The 2026 research tested a 3.6:1 ratio of myo-inositol to D-chiro-inositol combined with antioxidants. This specific ratio was chosen based on previous research suggesting it may best support ovarian function in women with PCOS.
Can inositol supplements improve egg quality?
The 2026 study suggests yes. Women taking the inositol supplement had higher fertilization rates (77.66% vs. 71.61%) and were less likely to have poor-quality embryos, indicating the supplement may protect and improve egg quality.
Is this supplement safe for women with PCOS?
The study found no safety concerns with the supplement taken for one month before treatment. However, always discuss any new supplement with your doctor first, especially if you take medications or have other health conditions.
Want to Apply This Research?
- Track daily supplement intake (yes/no) and note the specific supplement brand and dosage. Also track cycle day, any side effects, and energy levels to monitor how you feel while taking it.
- Set a daily reminder to take the supplement at the same time each day (such as with breakfast). Mark off each day on a calendar to ensure you take it consistently for the full month before your fertility treatment begins.
- Log supplement adherence weekly and note any changes in energy, mood, or digestive symptoms. After starting fertility treatment, track all cycle metrics (eggs retrieved, fertilization rates, embryo quality) and compare them to your baseline or previous cycles if applicable.
This research is a pilot observational study and should not replace medical advice from your fertility doctor or healthcare provider. While the findings are promising, larger studies are needed to confirm these results. Do not start any new supplement without discussing it with your doctor first, especially if you are pregnant, breastfeeding, taking medications, or have other health conditions. Individual results may vary, and this supplement is not guaranteed to improve fertility outcomes. Always work with your healthcare team to develop a comprehensive fertility treatment plan.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.