blood clots: https://www.nature.com/articles/s41591-023-02223-9.

Evidence in vitro suggests enhanced platelet activity. Plasma levels of erythritol are sustained for >2d above thresholds associated with platelet hyper-reactivity after consumption of realistic doses.

I use artificial sweeteners, but prefer sucralose or anything else to erythritol. I actually don't understand why people still use it (often in 'health food' because it's seen as 'natural'), there are much safer options.