Inositol vs berberine for insulin resistance in PCOS / PMOS

Why insulin resistance matters in PCOS / PMOS

PCOS was renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026 partly to reflect that it is not only about the ovaries. Many women with the condition have insulin resistance: the body makes insulin, but cells respond to it less well. Higher insulin can push the ovaries to make more androgens, which is linked to irregular cycles, acne and hair changes. Read more in PCOS is now PMOS.

Food, movement, sleep and stress come first. Supplements such as inositol and berberine are sometimes added alongside those habits, not instead of them.

How inositol works

Myo-inositol and D-chiro-inositol are naturally present in food and made by the body. Inside cells they help pass on insulin's signal. Trials in women with PCOS have looked at cycle regularity, ovulation and metabolic markers, with generally encouraging but mixed results. Some studies have investigated a 40:1 myo to D-chiro combination. Current international guidance does not recommend a specific inositol type, dose or combination. See how to take inositol.

How berberine works

Berberine is a plant compound that activates AMPK, the same energy-sensing switch that metformin influences. Human trials report improvements in fasting glucose, insulin and cholesterol, and a few PCOS trials report metabolic benefits. Stomach side effects are the main drawback, which is why it is usually split across meals. Our berberine vs metformin article covers the trials in detail.

Side by side

Which one fits which goal

• Irregular cycles, trying to ovulate: inositol has the larger body of PCOS-specific research.
• Raised fasting sugar or cholesterol: berberine has the stronger metabolic data.
• Sensitive stomach: inositol is usually easier to live with.
• Already on metformin: talk to your doctor before adding berberine.

Taking them together

Because they act differently, inositol and berberine are often combined, and no harmful interaction between the two is known. Give any routine about 12 weeks before judging it, and ask your doctor for repeat tests such as fasting glucose or HbA1c rather than going by feel alone.

Where Ova Balance fits

Ova Balance is a once-daily sachet that includes myo-inositol 2000 mg and D-chiro-inositol 50 mg alongside berberine HCl 300 mg, plus Quatrefolic® L-5-MTHF, vitamin D3, magnesium, zinc and chromium. The berberine amount is below the doses used in most berberine trials, so it is designed as daily nutritional support, not a treatment. Check the latest availability and label on the product page.

Frequently asked questions

This article is for general information and is not medical advice. Speak to your gynaecologist or doctor before starting a supplement, especially if you are pregnant, trying to conceive or taking medicine.