David Ortiz isn't 100 percent sure he has never used steroids, but if he did, it was when he was much younger. "I tell you, I don?t know too much about steroids, but I started listening about steroids when they started to bring that (expletive) up, and I started realizing and getting to know a little bit about it,? Ortiz said Sunday. ?You?ve got to be careful. . . . I used to buy a protein shake in my country. I don?t do that any more because they don?t have the approval for that here, so I know that, so I?m off of buying things at the GNC back in the Dominican (Republic). But it can happen anytime, it can happen. I don?t know. I don?t know if I drank something in my youth, not knowing it.?