Sometimes people say something with no true intention to inform their audience but for a covert intention other than that. In such cases, we may say, the information, as well as the informant, is manipulative. For example, we are told by the producer that a product has such and such good points, while her real intention is to make us buy it, and not just to let us know that the product has such and such good points.
Some other times people say something just to inform their intended audience, to share whit her what they think as true; they simply want their audience to know about whatever it is they are talking about. In such cases, information is not manipulative, it is just for the sake of informing, just for the sake of sharing the truth with the audience, just to let her know the thing whatever it is. What is a right word (adjective) to describe such kind of information.
Some examples are parents who inform their children in order to let them know things, good teacher when they inform students, and doctors when they inform patients.
One may simply say "non-manipulative information", but then it also covers unintentional information too. Besides, if we call it "truthful information", then manipulative information sometimes is true/truthful too.
So what we call a piece of information that is truly for informing.