10. C (taking a multivitamin). There is no good evidence that a multivitamin can lower blood pressure. Researchers estimate that you can expect systolic blood pressure to drop 4 to points from 30 minutes of exercise each day, 5 to 20 points by losing 20 pounds, 2 to 4 points by limiting alcohol, and 2 to 8 points by cutting salt to 2,400 mg a day.