High blood pressure is a serious burden on the vascular system. Atherosclerosis will precipitate heart disease, stroke and other cardiovascular diseases. A chemical called angiotensin II plays a harmful role in high blood pressure and is connected to hypertension and to arterial stenosis of the kidneys. Another enzyme called Angiotensin Converting Enzyme (ACE) changes angiotensin II which is an extremely strong vascular constrictor and leads to high blood pressure.
Dr. Hara has shown that green tea catechin impedes the action of “ACE” and suppresses production of angiotensin II. He has also demonstrated that the administration of catechin to mice with Spontaneously Hypertensive Rate (SHR) can reduce high blood pressure. Results of his experiments indicate that daily consumption of greentea catechin has the ability to prevent a rise in blood pressure. Y. Hara, T. Matsuzaki and T. Suzuki, Nippon Nogeikagaku Kaishi