Determine the efficacy of the investigational product versus placebo in reducing stress oxidative during the performance of a physical exercise of a certain intensity and duration.

The effectiveness of a probiotic for oxidative stress after eight weeks of the product to study will be checked. the sample will be formed by cyclists that will submit to a baseline exercise and after the product is taken.

Inclusion Criteria:

• Age: between 18 and 45 years
• Sex: male, of Caucasian race, selected from the general population.
• Subjects that perform aerobic physical exercise between 2 and 4 times a week.
• Volunteers capable of understanding the clinical study, willing to grant consent informed in writing and to comply with the procedures and requirements of the study

Exclusion Criteria:

• Subjects with a history of any chronic disease.
• History of bronchial asthma or chronic obstructive pulmonary disease, disease Reactive airways such as bronchial asthma, a history of bronchial asthma or severe chronic obstructive pulmonary disease.
• Sinus bradycardia, second or third degree of atrioventricular block, insufficiency manifest cardiac or cardiogenic shock.
• History of allergic hypersensitivity or poor tolerance to any component of the products under study.
• Participation in another clinical trial in the three months prior to the study Lack of will or inability to comply with clinical trial procedures.
• Subjects diagnosed and / or under treatment for arterial hypertension.
• Smoking subjects (> 10 cigarettes a day).
• Subjects with body mass index greater than 35 Kg / m2 (BMI> 30).
• Subjects with a history of drug, alcohol or other substance abuse or other factors that limit their ability to cooperate during the study.
• Subjects whose condition does not make them eligible for the study according to the researcher's criteria.