Myo-Inositol vs D-Chiro-Inositol: Understanding the 40:1 Ratio

A practical guide to the two inositol forms, why they are often paired, and what to check when comparing powder and capsule formulas.

What are myo-inositol and D-chiro-inositol?

Myo-inositol and D-chiro-inositol are two forms of inositol. They participate in different cellular signalling pathways, which is why some supplements combine them instead of using only one form.

Why is 40:1 discussed?

The 40:1 ratio is used in several combination formulas and has been studied in people with polycystic ovary syndrome. Research is still developing, and a ratio should not be treated as a guarantee of a particular result. The complete formula, daily serving, directions and individual health needs all matter.

Compare the daily serving—not one capsule

Front labels may show an amount per capsule, per scoop or per full daily serving. Check the recommended dose before comparing products. Fertiox powder provides 4,000 mg of myo-inositol, 100 mg of D-chiro-inositol and 400 mcg of folate per daily serving. The capsule format provides a different amount and serving size for customers who prefer convenience.

Powder or capsules?

• Powder can suit people who prefer mixing one measured serving into a beverage.

• Capsules can suit people who value portability and no mixing.

• Choose the format you can use consistently and follow the product label.

Use supplements responsibly

Read the full label, including warnings and non-medicinal ingredients. Speak with a qualified healthcare professional before use if you are pregnant, breastfeeding, managing a medical condition or taking medication.