What the hell is in these things?

I've taken kratom for years. The local smoke shop sells kava as well and even has a decently flavored pena colada extract I can tolerate the test of. I've taken extract shots supposedly stronger than feel free (including the opms black stuff and 7-oh products) and nothing has ever made me impulsively drive to the gas station before my shift to waste $20 every single morning like this. It's literally insane. I have 1kg of kratom capsules at home already and I'll rush off to buy a few feel frees just to get dissapointed that they don't even really work anymore. So I'll swear them off go back to kratom powder for a few days and then get a craving out of nowhere for them. I even tried ordering some instant kava that I can't mess up off amazon and took like 20 capsules of the free kava caps they included and got nowhere near similar results. 40mg of kratom is nothing. What the heck is in these things?