The troubled former `Two and a Half Men` star is no stranger to drugs - boasting about "banging seven gram rocks" of cocaine in February - but has admitted for the first time to using them for his film role as Ricky `Wild Thing` Vaughn in the 1989 baseball movie.
He told Sports Illustrated magazine: "Let`s just say that I was enhancing my performance a little bit. It was the only time I ever did steroids. I did them for like six or eight weeks. You can print this, I don`t give a f**k"
Charlie said the drugs - normally associated with bodybuilders - had a positive effect on his baseball throwing skills, adding: "My fastball went from 79 to like 85 [miles per hour]."
While his performance on the field improved, the trademark lightning bolt haircut he had to adopt for the film proved more problematic.
Charlie - who was 22 at the time of filming - added: "I didn`t like the haircut because it generated so many comments in bars. I`ve got enough of that already.
"Add that to the mix, and it`s a recipe for a fistfight."
Charlie was fired from `Two and a Half Men` after concerns were raised about his conduct offset, following his being sent to hospital after a 36 hour drink and drugs binge in January.