Is Maltitol Keto?
Maltitol is not keto-friendly because it is a high-carb sugar alcohol that may kick you out of ketosis even with small amounts.
High-Carb Sugar Alcohol
Too Much Carbs!
Maltitol should be avoided on keto because it is very high in net carbs (52.5g of net carbs per 100g serving).
It is important to limit your net carb consumption to 20g - 30g per day to stay in ketosis. You can calculate your ideal daily net carb allowance by using this keto macros calculator.
As an alternative, you may look for other sweeteners that are low in net carbs.