We will test whether EPO-Boost™ affects EPO levels, a number of blood parameters, and VO2max (maximal aerobic capacity) by recruiting 40 trained endurance athletes (20 males and 20 females). To be included, subjects must already be performing aerobic exercise at least 4 days per week for a minimum of one hour each day. Participants will be randomly assigned (within gender) to either the placebo (n=20) or supplement group (n=20). A 25% dropout rate may be expected in both genders, therefore we are recruiting a subject number of 40 participants to ensure that at least 30 subjects will complete the study. All participants will be blinded as to whether they are receiving the placebo or the supplement. Participants will report to the Human Nutrition Lab (HNL) and the Exercise Physiology Lab for baseline testing. Height, body weight, body composition, and blood samples will be obtained. Participants will then answer questions regarding their current and usual exercise patterns. These questions will address the type, frequency, duration, and intensity of exercise. Finally, participants will perform a VO2max test in the Exercise Physiology Lab. After baseline testing the participants will be given a supply of either EPO-Boost™ or placebo along with extra capsules. The subjects will not know whether they are receiving the product or the placebo. Participants will also be asked to consume a multivitamin pill daily for the entire 35-day intervention period. Finally, participants will be asked to keep an exercise log during the 35-day intervention documenting type, duration, intensity, and days of exercise in order for research personnel to ensure that exercise training is not changing. The capsule and exercise logs will be collected at days 14 and 35.