Is Inositol a Sugar?
Inositol is often described as a type of sugar, but that answer needs a little context. Chemically, inositol is often classified as a carbocyclic sugar or sugar alcohol-like compound. It has a structure related to carbohydrates, but it does not behave like table sugar in the way most people think about sugar in food. (Myo-Inositol)
Many health sites simplify this by saying that inositol is “a sugar made in the body and found in foods.” That is useful for general understanding, but it can also be misleading if people assume it raises blood sugar like regular sugar. Inositol is better understood as a carbohydrate-related molecule involved in cell signaling, including insulin signaling. (WebMD)
That is one reason inositol gets so much attention in PCOS and metabolic health. It is not used because it is a sweetener. It is used because it plays roles in how cells respond to signals, including signals related to insulin. So yes, inositol is often described as a type of sugar, but not in the ordinary food sense that most shoppers imagine. (Myo-Inositol)
The simple answer is this: inositol is chemically related to sugars, and many sources describe it as a sugar or sugar-like compound, but it is not the same thing as ordinary dietary sugar. It is better known for its role in cell signaling than for any role as a sweetener or source of calories. (Encyclopedia Britannica)