Lowering Blood Pressure.
Chiropractic adjustments to the upper neck were shown to lower high blood pressure. Researchers found a 14 mm Hg greater drop in systolic blood pressure, and 8 mm Hg greater drop in diastolic blood pressure following a cervical adjustment. This effect was greater than would result from two blood pressure medications given in combination, and it was adverse-event free.
Journal of Human Hypertension, March 2007