I used to like clen but with the new study I wont be using it ever again, I dont need live cells in my heart being replaced with scare tissue this is terrible for your heart along with A.S. it is a heart problem waitting to happen later in life ask Mike Mazarrota ex pro body builder with triple by pass at age of 38 , not good. as with any drug there are side effects but you can have a good diet and do cardio and get the same results without hurting your heart. Unless your getting paid big bucks for your body , I would stay away from this drug if your just a beach body guy. just my opinion after these new studys were published. I did like it when I did my 2 different cycles of it.