Of course, I know not to believe everything I read, and most sites don't mention it but WebMD says:

Xylitol is safe in the amounts found in foods. It seems safe as a medicine for most adults in amounts up to about 50 grams per day. Avoid higher doses. There is some concern that extremely high doses for long periods of time (more than three years) can cause tumors. Xylitol can cause diarrhea and intestinal gas. It is probably safe for children as a medicine in amounts up to 20 grams per day.

Livestrong doesn't mention that and neither does Sideeffects.com although they do mention the normal things for sugar alcohols. I couldn't find anything at pubmed.gov that suggests Xylitol causes tumors.

So I'm guessing it's safe for long term usage. Does anyone have any negative results or respected links (it's always best to check out both sides of the story).

Thanks.

Bob