not true... You should always take care of your internal organs bro. Milk thistle and cranberry is cheap; you should take it with any gear, especially orals. It can't hurt.
I know a guy who used alot of gear and died in his upper 20's from a heart attack. Now I can't say that the gear caused it but there is a possibility. I truthfully do not think it was from gear, or gear alone at least, but I do think you should take precautions.
but if you take precautions and cycle smartly I do not think the average person will experience liver and heart problems.