Comparison
Isomalt vs Maltitol
The short answer
Isomalt is the better pick for blood sugar: its glycemic index is about 2 versus about 35 for maltitol. Both are polyols that can upset the stomach. Maltitol tastes more like sugar, which is why it's common in sugar-free chocolate.| Side by side | Isomalt | Maltitol |
|---|---|---|
| Safety score | 72/100 Use in moderation | 62/100 Use in moderation |
| Glycemic index | About 2 ✓ Better | About 35 |
| Sweetness vs sugar | About half | About 90% ✓ Better |
| Calories per gram | About 2 | About 2.1 |
| Keto | Small amounts, count half ✓ Better | Not keto-friendly |
| Gut upset | Yes, in large amounts | Yes, in large amounts |
| Safety score | 72 ✓ Better | 62 |
Swapping one for the other
If you're avoiding both, look for sugar-free candy sweetened with allulose or stevia, which aren't polyols and are gentler on the gut.
Common questions
Which is in sugar-free hard candy?
Usually isomalt. Maltitol is more common in sugar-free chocolate and baked goods.