Compositions, methods, and uses are contemplated in which a betalain-containing preparation is administered to a mammal to enhance athletic performance. Most preferably, the preparations are substantially nitrate free and acutely and transiently increase hematocrit, erythropoietin, adrenalin, and beta endorphin, while reducing serum lactate, serum lactate dehydrogenase, heart rate and a rate of perceived exertion.