Can confirm from personal experience. Even a lot of vipassana meditation by itself can send you into psychotic states when you're not ready for all the insight yet. I came very close to psychosis once, experienced ego death, broke down mentally and had to spend 2 months in a depression ward. Cannot recommend.
'ego death' can be really scary at first. There is an entire article in wikipedia about it ( https://en.wikipedia.org/wiki/Ego_death ) and how to integrate such experiences.
