Inclusion Criteria:  Healthy subjects from 18 to 35 years old Normal BMI (19-24.9 kg/m2)  Exclusion Criteria:  Impaired renal function (creatinine > 1.5 mg/dL) Liver impairment (liver enzymes over normal values) Glucosa 6-phosphate deshidrogenase deficency Any chronic disease Any acute disease in the last two weeks To be enrolled in other clinical study