Magnesium. High magnesium intake is associated with lower blood pressure and may have a synergistic effect with potassium. Increasing both nutrients while moderately reducing sodium can lower blood pressure to the same extent as a single medication (17). Magnesium stimulates vasodilators and can inhibit free radical formation in blood vessels (18). Nuts, seeds, spinach, beet greens, and chocolate are good whole food sources.

Swearing off cigarettes is probably the single best thing you can do for your heart. It’s good for your health in general, too. Not only does smoke hurt you over the long term, but your blood pressure goes up every time you have a cigarette. Lower your blood pressure and prolong your life by quitting. If you need help getting started, talk to your doctor.
Eighty million U.S. adults, or one in three, have hypertension (1). Another one in three have prehypertension, defined as blood pressure in the range of 120–139/80–89 mmHg. In addition to costing $48.6 billion annually, hypertension is a major risk factor for cardiovascular disease, congestive heart failure, chronic renal failure, and stroke (1). Even prehypertension increases the risk of death from CVD (2). Because of its severity, hypertension requires immediate treatment, but prescription drugs may not be the answer.
Although certain supplements may be helpful, it's important to understand they should never be used as a substitute for basic lifestyle choices that treat the real cause of the problem. Using only supplements without modifying your lifestyle is an allopathic approach not very different from using drugs. In most instances, it is not likely to be effective. Once you have made some beneficial changes to your lifestyle, you can then consider some of the following supplements as a way to further enhance your health:
Cat’s claw is an herbal medicine used in traditional Chinese practice to treat hypertension as well as neurological health problems. Studies of cat’s claw as a treatment for hypertension in rodents indicate that it may be helpful in reducing blood pressure by acting on calcium channels in your cells. You can get cat’s claw in supplement form from many health food stores.
1. Isometric handgrip exercises. An American Heart Association study found that squeezing a spring-loaded handgrip for two minutes, over a period of 12 to 15 minutes three times a week, can help lower blood pressure. Why? The study found that blood flow returns to your hands after the isometric exercise, improving blood vessel function. Another study reported in the journal Hypertension found this exercise produced a 10% drop in both systolic (top number) and diastolic (bottom number) readings when practiced six times a day, five days a week for four weeks.