What it is
Myo-inositol is a sugar-like substance the body makes and that is found in fruit, cereals and legumes. It is sold as powder and sachets, often with folate or D-chiro-inositol, and is frequently promoted to women with polycystic ovary syndrome or difficulty conceiving. It has no authorised EU health claims.
When someone asks for it at the counter, the best contribution is context: what has really been studied, and that a diagnosis and a pregnancy plan are handled by their doctor.
What is known
It takes part in insulin and other hormone signalling inside cells:
- It has been studied in polycystic ovary syndrome, with small and mixed results.
- It does not replace treatment prescribed by a doctor.
- At high doses it can cause digestive upset.
At the counter
When to recommend it
- A woman already diagnosed who wants to discuss it with her doctor: guide on the evidence
- Usual product doses, never above the label
- As one more supplement, never in place of medical follow-up
When not to
- To "treat" a diagnosis without their doctor knowing
- Pregnancy: only on the advice and knowledge of their gynaecologist
- Minors without medical indication
Warnings
- Important Do not present it as a solution to a fertility problem or a diagnosed syndrome: follow-up is medical.
- Caution No authorised EU claim: results cannot be promised.
- Caution It is often sold in combinations with other substances: read the whole label, especially in pregnancy.
- Worth knowing At high doses it can cause nausea, gas or diarrhoea.
Pharmacokinetics
- Absorption
- Good by mouth.
- Distribution
- Spreads through tissues; the body also makes it.
- Metabolism
- Converted into other forms of inositol depending on the tissue.
- Elimination
- The excess leaves in urine.
What to expect and what not
| Aspect | What is seen on social media | What can be said |
|---|---|---|
| Evidence | Presented as conclusive | Limited and mixed |
| Role | As a substitute | Supplement, never a substitute |
| Follow-up | Not mentioned | Always with their doctor |
| Safety | "Natural, no risk" | Well tolerated, but not free of discomfort |
Guiding realistically is more useful, and legally safer, than selling hope.
Self-assessment
Three questions. When you check your answers you will see the explanation for each one.
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Limited evidence, and it does not replace medical follow-up.
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It does not.
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They may contain other substances not indicated in pregnancy.
Training content. It does not replace the summary of product characteristics or clinical judgement.