Superdrol is more toxic...that shit is hard on the body from the kidneys to the liver, but the strength goes way up and you SEE results. if you take it, you better drink plenty of water and take some supps to protect the liver. i have noticed a jaundiced look to my skin and eyes and my back cramps like hell...not to mention the DARK urine. i just finished the Superdrol part of my cycle...thank God!