Hard time with cereals, which are vegan?

By reading the labels we think we are seeing everything. From researching online, though, it looks like things like vitamin D comes from animal sources etc etc. Does anybody know of a cereal that is for sure vegan? I like raison bran but I don't think it is. I read that crispix is vegan...........but what I really want is something with bran like raison bran. Thanks! I use rice dream with cereal, by the way.