It is very common for the stomach to be upset by sugar-free/reduced sugar sweets as they often contain sugar alcohols with low tolerance levels for the stomach and intestines. Erythritol, which is found in TWEEK products, belongs to the category of sugar alcohols, but is one of the sugar alcohols with the highest tolerance levels. In addition, we have such small amounts of erythritol in our candy that it is not considered to have a laxative effect. Our candy is high in fiber, which can stimulate sensitive stomachs. Everyone is different, try what works best for you.