Depending on color it will either give you energy or knock you out. To me a red strain feels like I took a bunch of benedryl (yuck). White or greens are what I liked when I was taking it, gave me a nice mood lift, euphoria and energy similar to a couple cups of coffee. It was kinda fun for a month, then tolerance builds and you actually get less of the benefits the higher doses you take. Bought hundreds of dollars worth of different strains and threw most of it away. I’d rather pop an oh sea lol but to answer your question, I never felt anything off of shit k. Even good quality k some strains just didn’t do much for me. White Borneo, white sunda, super green Malay, green bali, white and green maeng da were some of my favorites and seem to be good quality no matter which vendor you use.