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)."
Problem haircut
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.