glycerin

Wikipedia says that glycerin has a sweet taste. If glycerin is an ingredient, do you have to assertain that it’s from a vegetarian source?

“Ingredient Kosher” for Vegans

If I’m looking at a vegan product for year-round, what are the potentially-problematic ingredients to look out for? I presume vinegar, but anything else? I want to be able to decide for myself and know what to look for rather than post here every time I see...