SCOTTS VALLEY, Calif.—Source Naturals introduced XyliSmart, a sugar substitute that may reduce the risk of dental caries and does not promote tooth decay. XyliSmart is a low glycemic sweetener that helps manage healthy glucose levels in the body. Xylitol looks and tastes like sugar, but with 40 percent fewer calories, and without the undesirable side effects of sugar. Because it is absorbed slowly, it does not result in a blood glucose concentration spike, which can alter mood or energy levels.