Does the ratio in your inositol supplement actually matter?

Yes, and it's the detail most inositol supplements don't disclose. Myo-inositol and D-chiro-inositol are often marketed together as one ingredient, "inositol," but they work through different pathways in the body, and research suggests taking too much D-chiro-inositol relative to myo-inositol can work against, rather than support, ovarian function.

Not for use during pregnancy; talk with your healthcare provider before starting any new supplement, especially while breastfeeding.

Two compounds, two different jobs

A review of the combined myo-inositol/D-chiro-inositol therapy literature explains that myo-inositol has been specifically linked to beneficial effects on reproductive function, while D-chiro-inositol's role is more tied to insulin-related pathways. The same review notes that the physiological plasma ratio between the two, 40:1, tends to produce better clinical results than other ratios in the populations studied. If a supplement lists "inositol" without specifying the ratio, or leans heavily toward D-chiro-inositol, that's a meaningful gap in what you're actually getting.

"It's not a one-size-fits-all"

"It's not a one-size-fits-all."

— Dr. Samantha Ess, ND, Naturopathic Doctor specializing in hormone health and fertility

Dr. Ess's broader point about individualized care applies directly to inositol ratio. There isn't one inositol product that works identically for everyone, but there is a documented, studied ratio worth knowing about and asking your provider whether it fits your situation, rather than assuming any "inositol" label is equivalent to any other.

What to check before buying an inositol supplement

Look for the specific milligram amounts of myo-inositol and D-chiro-inositol listed separately, not just a combined "inositol blend" total. Myo Chiro 40:1, a fertility-focused hormone support formula, discloses exactly this: 2,000 mg myo-inositol to 50 mg D-chiro-inositol per serving, the 40:1 ratio referenced in the research above.†

"Every Pink Stork product is not only backed by science, it's also covered in prayer."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

Our inositol supplement for ovarian and reproductive wellness is third-party tested and manufactured in cGMP-certified facilities. For more, read what the best inositol ratio for irregular periods is and does an irregular cycle mean something is wrong with me.

Frequently asked questions

Why does the ratio between myo-inositol and D-chiro-inositol matter?

The two compounds work through different pathways in the body. Research suggests that too much D-chiro-inositol relative to myo-inositol may work against, rather than support, healthy ovarian signaling.

How do I know what ratio is in a supplement I'm considering?

Check the supplement facts panel for separate milligram amounts of myo-inositol and D-chiro-inositol. If only a combined "inositol" total is listed, the ratio isn't disclosed.

Is more D-chiro-inositol always better?

No. Research points to the physiological 40:1 ratio, heavily weighted toward myo-inositol, as producing better results than other ratios tested in the research populations studied.

What ratio does Myo Chiro 40:1 use?

2,000 mg of myo-inositol to 50 mg of D-chiro-inositol per serving, a 40:1 ratio.†

Should I ask my doctor before switching inositol products?

Yes, especially if you're currently taking a different ratio or dose, are pregnant, or are managing a diagnosed condition.

† 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.