I'm not taking it. The reason I'm not taking it . . . I think it has been shown, like you said, it can possibly prophylactically prevent cancer so far. I think the studies that have shown that have been pretty short-term. My concern with metformin is the feedback mechanisms that happen when you're taking this drug. How is that going to affect other cells and how they respond to glucose and things like that over the long-term, like 15 years down the line?