Myo-inositol and D-chiro inositol are two forms of the same compound, and many supplements combine them in a 40:1 ratio. Here's what each one is, what the 40:1 ratio means, and how to choose between powder, drops and capsules.
What is inositol?
Inositol is a naturally occurring carbohydrate compound, sometimes loosely called "vitamin B8", although it isn't actually a vitamin because the body can make it. It's found in foods such as fruit, beans, grains and nuts.
There are nine forms of inositol. The two you'll see in supplements are myo-inositol and D-chiro inositol.
Myo-inositol vs D-chiro inositol
| Myo-inositol | D-chiro inositol | |
|---|---|---|
| What it is | The most common form of inositol in food and in the body | A less common form of inositol |
| Typical amount in a 40:1 serve | About 2,000mg | About 50mg |
| Sold as | Powder, capsules, drops | Usually combined with myo-inositol |
What does the 40:1 ratio mean?
A 40:1 ratio simply means there are 40 parts myo-inositol for every 1 part D-chiro inositol. For example, a serve with 2,000mg of myo-inositol contains 50mg of D-chiro inositol. It's the ratio most commonly used in combined inositol supplements.
Powder, drops or capsules?
- Powder: the most cost-effective option per serve. Mild, slightly sweet taste that mixes into water. Try MAYN Myo & D-Chiro Inositol 40:1 Powder.
- Liquid drops: easy to measure and add to a drink. See MAYN Myo + D-Chiro Inositol 40:1 Liquid Drops.
- Capsules: nothing to mix and easy to take on the go. Check the label for the number of capsules per serve.
What to look for when buying inositol in Australia
- The ratio and the amounts: look for the milligrams of each form per serve, not just "40:1".
- Serves per pack: divide the price by the number of serves to compare value.
- Other ingredients: check for added sweeteners, flavours or fillers if you prefer to avoid them.
- An Australian seller: local customer service, prices in AUD and fast delivery.
Talk to your healthcare professional before starting inositol if you are pregnant, breastfeeding, taking medication or have a medical condition.
This article is general information, not medical advice. Always read the label and follow the directions for use. Dietary supplements should not replace a balanced diet.
