Naturally Inhibit the ACE Enzyme, Reducing Blood Pressure
Green Tea is considered a natural cure for high blood pressure because it inhibits ACE (angiotensin converting enzyme) and lowers blood pressure without the nasty side effects.
Many factors can cause arteries to narrow - plaque buildup, smoking, poor diet, lack of exercise, alcoholism, stress, certain diseases such as diabetes, or a "signal" from the body. This signal is the release of an enzyme called ACE. ACE starts a chain reaction that causes the tiny muscles surrounding the arteries to clamp down, making the arteries smaller and driving up blood pressure. Preventing this "clamping down" of the muscles and keeping the arteries from narrowing is an important step in preventing high blood pressure.
-http://ezinearticles.com/?Green-Tea-As-A-High-Blood-Pressure-Natural-Remedy&id=363804
Lower Blood Pressure - Reduce Heart Attack & Stroke Risk
Hundreds of studies show that green tea has many other impressive health benefits as well. It decreases your risk of heart attacks and strokes by lowering levels of cholesterol and blood pressure, as well as by slowing the development or atherosclerosis ("hardening" of the arteries).
-Waking the Warrior Goddess, Kristine Horner, M.D.
Lowers Blood Pressure and Helps Prevent Hypertension
A study published in the July 2004 issue of the Archives of Internal Medicine found that among persons consuming tea regularly for at least one year, the risk of developing high blood pressure was 46% lower among those who drank ½ cup to 2 ½ cups per day, and 65% less among those consuming more than 2 ½ cups per day.
-www.whfoods.org