Myo-inositol (often with D-chiro-inositol)

Supplement
ALSO SOLD WITHOUT PRESCRIPTION

Myo-inositol is a supplement. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.

Also called: inositol, myoinositol, d chiro inositol

What it is used for

Taken for PCOS (polycystic ovary syndrome) to help regular periods and insulin sensitivity.

How it works

A sugar-like compound that improves insulin sensitivity; used in PCOS for cycle regularity and ovulation, and in pregnancy diabetes prevention research.

How to take it

Usually 2 to 4 g a day, often with folic acid and D-chiro-inositol in a 40:1 ratio.

Common side effects

  • Nausea
  • Wind
  • Loose stools at high doses

Get medical help straight away if

Allergic reaction

Be careful

Generally well tolerated; may cause mild stomach upset. PCOS needs a doctor's assessment.

Other medicines and interactions

May add to diabetes medicines (lower sugar).

Pregnancy and breastfeeding

Studied in pregnancy; ask your doctor before use.

Common questions

What is Myo-inositol used for?

Taken for PCOS (polycystic ovary syndrome) to help regular periods and insulin sensitivity.

How does Myo-inositol work?

A sugar-like compound that improves insulin sensitivity; used in PCOS for cycle regularity and ovulation, and in pregnancy diabetes prevention research.

How should I take Myo-inositol?

Usually 2 to 4 g a day, often with folic acid and D-chiro-inositol in a 40:1 ratio.

What are the side effects of Myo-inositol?

Common: Nausea, wind, loose stools at high doses. Get help straight away for: Allergic reaction.

Does Myo-inositol interact with other medicines?

May add to diabetes medicines (lower sugar).

Is Myo-inositol safe in pregnancy and breastfeeding?

Studied in pregnancy; ask your doctor before use.

Does Myo-inositol need a prescription in India?

It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.