It's kind of safe... i dunno it has some kind of neuromodulating / nuerogenic effect that when used in combo with other stuff, depending on what your mindset is (perhaps in a different state of mind one would not even have the thought occur to them to put this in their body), its not really that great. My experience with it was it was in combo with phenibut and some other stuff in capsules from a local health food store, and in combo with methamphetamine over long periods of time redosing etc i had not that good of a time with it.
To answer your question, no, ashwaganda does not contain salycilic acid. A simple google search or 2 would have answered your questions, plus more.