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OtherModerate evidence

Inositol

Also known as: myo-inositol, D-chiro-inositol

Inositol is a vitamin-like compound involved in insulin signalling and some neurotransmitters. It is studied most in polycystic ovary syndrome (PCOS).

What it is used for

  • Menstrual cycle and insulin sensitivity in PCOS – moderate evidence
  • Fertility in PCOS – weak to moderate evidence
  • Anxiety and mood – weak evidence

Forms and how they differ

myo-inositol

best-studied form, usually in gram doses

myo- + D-chiro-inositol (40:1)

combination mimicking the body's ratio, common for PCOS

inositol in choline complexes

the dose is often low – check the label

When to take it

Usually split morning and evening; dissolve the powder in water.

Pairs well with

Works well with folate and vitamin D.

Do not combine / separate

If you take diabetes medicines, monitor blood glucose – effects may add up.

Watch out for

In pregnancy only after consulting your doctor. If you have diabetes, bipolar disorder, kidney or liver disease or take medicines, consult your doctor.

Safety

Well tolerated at usual doses; higher doses may cause bloating or loose stools. Do not exceed the label dose.

Practical tip

In PCOS the effect is judged after 3 months of regular use – not after a few days.

Products containing Inositol 8

Inositol 500 mg500 mg / servingWomen’s healthHormonesBlood sugar & metabolismFertility
Inositol 650 mgmyo-inositol · 650 mg / capsuleWomen’s healthHormonesBlood sugar & metabolismFertility
Inositol 750 mgmyo-inositol · 750 mg / capsuleWomen’s healthHormonesBlood sugar & metabolismFertility
L-theanine + Inositolfree formStressFocusSleepMood
L-theanine + Inositol 200 mgfree form · 200 mg / capsuleStressFocusSleepMood
Inositol myo-inositolmyo-inositolWomen’s healthHormonesBlood sugar & metabolismFertility
Inositol myo-inositol + D-chiro-inositolmyo-inositol + D-chiro-inositolWomen’s healthHormonesBlood sugar & metabolismFertility
Inositol + FolatepowderWomen’s healthHormonesBlood sugar & metabolismFertility
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

Check Inositol with others

Which supplements do you actually need?

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From the same group

AlfalfaNo evidenceAndrographisWeak evidenceAroniaWeak evidenceBarley grassWeak evidenceBee pollenWeak evidenceBeef organs (desiccated)Weak evidence
Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.