Myo-Inositol & D-Chiro-Inositol
Other ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Myo-inositol and D-chiro-inositol are inositol stereoisomers used most often in a 40:1 ratio for polycystic ovary syndrome support. Evidence suggests possible improvements in ovulation, menstrual regularity, insulin resistance, and some androgen markers, but guideline reviews rate certainty as limited and outcomes vary. It should be used as an adjunct to evidence-based PCOS care, not as a replacement for evaluation of infertility, diabetes risk, or abnormal bleeding.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Myo-Inositol & D-Chiro-Inositol is an other most often used for may support ovulation in pcos, may improve menstrual regularity, may improve insulin resistance markers. NutriStack rates the overall evidence as moderate. A typical adult dose is 2,000 mg myo-inositol plus 50 mg D-chiro-inositol twice daily, commonly 4,000 mg/100 mg daily in a 40:1 ratio, commonly taken as powder or capsule providing a disclosed 40:1 myo-inositol to d-chiro-inositol ratio. This profile indexes 3 sources.
- Nausea
- Bloating
- Loose stools
- Pregnancy treatment or fertility treatment without clinician guidance
- Use with diabetes medications without glucose monitoring
The bottom line
Evidence rating moderate. Most-documented uses: may support ovulation in pcos, may improve menstrual regularity, may improve insulin resistance markers. 3 sources indexed (2015–2024), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Inositol phosphoglycans act as second messengers in insulin and follicle-stimulating hormone signaling. Myo-inositol is important in ovarian follicle signaling and oocyte environment, while D-chiro-inositol is more closely linked to insulin-mediated glycogen and androgen pathways. A 40:1 myo-inositol to D-chiro-inositol ratio is intended to approximate physiologic plasma balance and avoid excessive D-chiro-inositol exposure that may be unfavorable for ovarian function.3,1
Dosing & protocol.
Can be taken with or without food. Splitting twice daily may improve GI tolerance and steady exposure.
What it actually costs.
Real-world pricing across three quality tiers. Assumes 40:1 inositol powder.
Powders are usually cheaper per gram than capsules at clinically used doses. Updated 2026-06-04.
Full safety detail.
Side effects
- Nausea
- Bloating
- Loose stools
- Headache
- Dizziness
- Possible hypoglycemia symptoms when combined with glucose-lowering agents
Contraindications
- Pregnancy treatment or fertility treatment without clinician guidance
- Use with diabetes medications without glucose monitoring
- Abnormal uterine bleeding without evaluation
- Bipolar disorder or severe psychiatric illness without clinician review because rare mood activation has been reported with related inositol use
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS GuidelinesFitz V et al. · Journal of Clinical Endocrinology and Metabolism · 2024
Inositol may improve some metabolic and reproductive PCOS outcomes, but evidence certainty was limited for several endpoints.
Randomized controlled trials
1- 2The 40:1 myo-inositol/D-chiro-inositol plasma ratio is able to restore ovulation in PCOS patients: comparison with other ratiosNordio M et al. · European Review for Medical and Pharmacological Sciences · 2019
The 40:1 ratio was associated with better ovulation restoration than several other tested ratios.
Reviews & position papers
1- 3Results from the International Consensus Conference on Myo-inositol and D-chiro-inositol in Obstetrics and Gynecology: the link between metabolic syndrome and PCOSBevilacqua A et al. · European Journal of Obstetrics, Gynecology, and Reproductive Biology · 2015
Consensus review described biologic rationale and clinical use patterns for MI and DCI in PCOS.
Common questions.
Quick answers about Myo-Inositol & D-Chiro-Inositol, drawn from the data on this page.
What is Myo-Inositol & D-Chiro-Inositol?
Myo-inositol and D-chiro-inositol are inositol stereoisomers used most often in a 40:1 ratio for polycystic ovary syndrome support. Evidence suggests possible improvements in ovulation, menstrual regularity, insulin resistance, and some androgen markers, but guideline reviews rate certainty as limited and outcomes vary. It should be used as an adjunct to evidence-based PCOS care, not as a replacement for evaluation of infertility, diabetes risk, or abnormal bleeding.
What is Myo-Inositol & D-Chiro-Inositol used for?
Commonly cited benefits of Myo-Inositol & D-Chiro-Inositol include: May support ovulation in PCOS; May improve menstrual regularity; May improve insulin resistance markers; May reduce androgen-related symptoms in some users; May support oocyte quality in selected fertility settings. NutriStack rates the overall evidence as moderate.
What is a typical dose of Myo-Inositol & D-Chiro-Inositol?
A typical adult dose of Myo-Inositol & D-Chiro-Inositol is 2,000 mg myo-inositol plus 50 mg D-chiro-inositol twice daily, commonly 4,000 mg/100 mg daily in a 40:1 ratio. The commonly recommended form is Powder or capsule providing a disclosed 40:1 myo-inositol to D-chiro-inositol ratio. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Myo-Inositol & D-Chiro-Inositol?
Reported side effects include nausea, bloating, loose stools, headache, dizziness, possible hypoglycemia symptoms when combined with glucose-lowering agents. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Myo-Inositol & D-Chiro-Inositol?
NutriStack rates this as Moderate, meaning several aligned RCTs or one large RCT plus supporting reviews. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Myo-Inositol & D-Chiro-Inositol in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.