In the review in BMC Cardiovascular Disorders, the authors found that most of the studies that showed garlic’s blood pressure-lowering effect used a dosage of 600 to 900 milligrams of garlic per day. How Many Cloves. You may be able to lower your blood pressure by consuming 1/3 to 1 1/2 grams of fresh raw or dried garlic daily. Since most garlic cloves are about 3 grams, this is equivalent to 1/10 to 1/2 a garlic clove daily. Your blood pressure may be lowered more if you eat more.