Inclusion Criteria:  - Clinical hypertension, medically treated with no more than 2 drugs  Exclusion Criteria:  Body mass index above 35 kg/m2 Fasting blood cholesterol levels below 115 mg/dL Fasting blood glucose levels above 126 mg/dL Taking anyone of the Angiotensin-converting enzyme inhibitors Anemia (hemoglobin below 13 g/dL in men and below 12 g/dL in women) Vitamin or nutraceutical intake in the last 30 days before the study enrollment Chronic gastrointestinal diseases Pregnancy and breastfeeding Garlic allergy Participation in another study 30 days before the study enrollment