Erythritol is a sugar alcohol. Too much of it may lead to gas and bloating in some people. It has not been shown to have the same negative side effects as things like Splenda and Sweet 'n Low, but some people will get gassy if they have too much of it. You're right, a lot of monk fruit products may contain erythritol, and I recommend trying out what works for you. A little bit in your coffee may be fine, but baking with monk fruit mixed with erythritol may cause bloating. Everyone is different. Just know, erythritol does not carry the same negative implications as artificial sweeteners.