It has been shown to "rewire" the brains of people with PTSD and allow them to move on past their fears,
it has also been shown to alleviate depression within 30 minutes when given to suicidal persons.
on the other hand my son has worked security at a few big Lollapalooza events and said the "k" people were the most vile filthy individuals ever when sober.. but were cool when on the drug.
“... when used properly,...” as with nearly everything.