Why does the inositol ratio matter for hormone health?

Because myo-inositol and D-chiro-inositol are both naturally occurring in the body, but research shows the ratio between them, not just their presence, determines how well they work together.† A clinical trial testing seven different ratios found that a 40:1 ratio of myo-inositol to D-chiro-inositol outperformed every other ratio tested for the outcomes researchers were measuring. Ratio and dose are the science. "Natural" is just a marketing word.

What the ratio research actually found

A 2019 clinical trial tested seven different formulations of myo-inositol (MI) and D-chiro-inositol (DCI), including DCI alone and ratios ranging from roughly 1:3.5 up to 80:1. Researchers found that the 40:1 MI to DCI ratio produced the best outcomes for the measures being studied, including ovulation and hormone markers like FSH, LH, and free testosterone, compared with every other ratio tested in the trial.

This particular study was conducted in women with polycystic ovary syndrome specifically, since much of the existing inositol-ratio research has focused on that population. A separate academic review of the myo-inositol and D-chiro-inositol research literature similarly noted that the 40:1 ratio has become a reference point in this area of research, distinct from other ratios that have been studied and found less effective for the outcomes measured.

Why every other ratio tested was less effective

What makes this research notable isn't just that 40:1 worked. It's that the other ratios tested, including DCI-heavy blends sometimes marketed as "more potent," did not perform as well on the same measures. This runs counter to an assumption a lot of supplement marketing leans on, that more of an active-sounding ingredient is automatically better. In this specific body of research, that assumption did not hold. The ratio, not just the raw dose of either compound, was the variable that mattered.

What this means for choosing an inositol supplement

Almost any product can claim its ingredients are "natural," since myo-inositol and D-chiro-inositol both occur naturally in the body already. That claim says nothing about whether a given product uses a ratio backed by research. Pink Stork's clinically studied inositol ratio for hormone health, Myo Chiro 40:1, is formulated with a 2000 mg to 50 mg ratio of Myo-Inositol to D-Chiro-Inositol, reflecting the 40:1 ratio referenced in this research, to support healthy hormone signaling, ovarian health, and menstrual cycle regularity.†

Before buying any inositol supplement, check the ratio on the label, not just the presence of the ingredient. A product listing only "inositol" without specifying the MI to DCI ratio does not give you enough information to know what you are actually getting.

Trust signals

• Myo Chiro 40:1 uses a clinically studied 40:1 ratio.
• Myo Chiro 40:1 is third-party tested in cGMP-certified facilities.
• Pink Stork is a woman-founded, woman-led brand.

Frequently asked questions

Why does the myo-inositol to D-chiro-inositol ratio matter?

Research testing seven different ratios found that a 40:1 ratio of myo-inositol to D-chiro-inositol outperformed every other ratio tested for the outcomes measured, including ovulation and hormone markers.

Is more D-chiro-inositol always better?

No. The research found that DCI-heavier ratios performed less effectively than the 40:1 ratio on the measures studied, contrary to the assumption that more of an active ingredient is automatically better.

Does "natural" tell you anything about the ratio in a supplement?

No. Both myo-inositol and D-chiro-inositol occur naturally in the body, so a "natural" label doesn't indicate whether a product uses a research-backed ratio.

What should I look for on an inositol supplement label?

Check for the specific ratio of myo-inositol to D-chiro-inositol listed on the label, rather than relying on general ingredient claims alone.

Is Myo Chiro 40:1 safe during pregnancy?

No. Myo Chiro 40:1 is not intended for use during pregnancy. Always consult your healthcare provider before starting any new supplement, especially while breastfeeding.†

Can Myo Chiro 40:1 support general cycle regularity?

Yes. Myo Chiro 40:1 is formulated to support healthy hormone signaling, ovarian health, and menstrual cycle regularity as part of a general wellness routine.†

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.