In the clubhouse of the Mariners, who last year hit more home runs than any club in history (264), fat canisters of creatine are piled above lockers like cords of wood. Creatine monohydrate is a naturally occurring compound consisting of three amino acids. In nontechnical terms, it's fuel for muscles. A study by Penn State's Center for Sports Medicine found that members of a control group taking creatine grew stronger after just seven days.
"Three or four years ago, the nutritional supplement market for baseball players didn't even exist," says Dave Rose, a manager with Champion Nutrition of Concord, Calif., which supplies several major league teams with a variety of nutritional additives. "Now it's gone crazy. The market for baseball is bigger than for football or basketball."
"Let's face it, guys get paid for home runs," Piazza says. "If you hit 30 home runs, nobody cares if you hit .250 doing it. That extra strength may be the difference of five to 10 feet—the difference between a ball being caught or going over the wall. Why wouldn't you lift and take supplements? You've got one time in your life to get it right. I want to get it right."
Piazza is the prototypical player of this new power generation. He was born 10 days before Denny McLain won his 30th game in 1968, the Year of the Pitcher. Only three major league players drove in 100 runs that season; in '97, Piazza was one of 35 players with at least 100 RBIs. No catcher has ever caught as many games (139) and batted higher than Piazza did last year, when he hit .362 (along with 40 home runs).
Then he spent the off-season lifting weights with bronzed bodybuilders while his personal shopper-chef-nutritionist whipped up six meals a day for him: omelettes, pancakes, tuna, chicken, steak and, daily, a creatine shake. He reported to camp at 240 pounds, expecting the rigors of catching to wear him down to 225 by the end of the season. He says, "I want to go out and top last season."