Although athletic training increases the body's reserve capacities, it also can add to oxidative and other forms of stress. For example, it is well-established that endurance runners often suffer a reduction in immune response for a period of time after having engaged in intense competition. Moreover, the needs of endurance and power athletes differ. Therefore, successful athletic formulas are those which match the needs of the different classes of athletes who use them. An athletic product line therefore should include both specialty items and broad-spectrum formulations designed to meet antioxidant and other needs. The Jarrow line includes high-performance items such as whey protein, ribose, tribulus, chrysin, Muscle OptiMeal and other supplements along with a variety of creatine products.