Like everything else in Judaism, it is kosher if a poseik says it’s kosher. If you need a psak, ask Rav Shmuel Irons of Detroit. He has studied this subject extensively.
There have been rare cases where a poseik has been matir this. For instance, someone had painful rashes that no doctor could explain and that did not heal. A past life regression revealed that this person had burned to death in a previous life. That knowledge resulted in being able to heal the rashes. (I don’t remember how exactly, but I think they used compresses that had been soaked in a mixture that contained kerosene.) However, in general, we are supposed to assume that the information we need is available via normal hishtadlus such as doctors, psychiatrists, etc. If it was good for us to know more, Hashem would have made it available via normal hishtadlus.