Erythritol is a 4-carbon sugar alcohol that unlike other sugar alcohols (sorbitol, manitol, etc) is easily and completely absorbed in the small intestine. It is low FODMAP. It never gets to the colon like other sugar alcohols were it can be fermented by colonic bacteria to produce gas etc worsening IBS symptoms. Here is a great article on this topic
And here is a scientific article that gives a lot more details published in the prestigious journal Nature
"Consumption of 20 and 35 g erythritol by healthy volunteers, in a liquid, is tolerated well, without any symptoms. At the highest level of erythritol intake (50 g), only a significant increase in borborygmi and nausea was observed, whereas xylitol intake at this level induced a significant increase in watery faeces."
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Erythritol is a sugar alcohol but not an IBS trigger
