Jelly Belly Candy Co. says its Extreme Sports Beans are targeted at adult athletes. DoubleKick Hot Sauce contains 12 milligrams of caffeine per teaspoon-size serving.
Caflex makes caffeinated marshmallows in chocolate, coffee and mint flavors, among others.
How much is plenty no good? Mayo Clinic says 200 to 300 milligrams of caffeine per day (two to four cups of brewed coffee) isn't harmful. "But more than 500 milligrams can cause insomnia, nervousness and rapid heartbeat." The Food and Drug Administration advises pregnant women to limit their caffeine intake more strictly.
The success of caffeine-laced energy drinks like Monster and Amp has demonstrated the appetite for products that deliver a boost. Food products packed with caffeine, though still small compared with energy drinks, are growing quickly, with U.S. retail sales up 49% to $1.6 billion since 2008.