What the Hell Is In LaCroix? Posted on Posted on07/05/201807/05/2018By EYEONFOOD Share This!What the Hell Is In LaCroix? LaCroix is the fizzy water of the moment. It’s just H2O, CO2, and natural flavor. But what’s “natural flavor” and is it safe to consume by the daily 12-pack? Asking for a friend. Share This!