Recent studies show that hibiscus
tea can lower blood pressure as effectively as some standard hypertension drugs
can. Hibiscus is widely consumed around the world as a ruby-colored, lemony
beverage (it’s the main ingredient in Red Zinger tea). Hibiscus is safe and,
unlike most blood pressure drugs, rarely causes side effects. Plus, hibiscus
plants can be grown in much of the United States, so you can actually grow your
own blood pressure medicine.
Hibiscus (Hibiscus sabdariffa)
has been used to treat high blood pressure in both African and Asian
traditional medicine. In 1996, researchers in Nigeria confirmed this age-old
wisdom by showing that hibiscus flowers reduced blood pressure in laboratory
animals. Soon after, researchers in Iran showed the same benefit in people.
After measuring the blood pressure of 54 hypertensive adults, the researchers
gave them 10 ounces of either black tea or hibiscus tea for 12 days. Average
blood pressure decreased slightly in the black tea group, but decreased a
significant 10 percent in the hibiscus group.
Since then, several additional
studies have confirmed this effect, including two that tested hibiscus
head-to-head against standard blood pressure medications:
- Scientists in Mexico gave 75 hypertensive adults either captopril (Capoten; 25 milligrams twice a day) or hibiscus tea (brewed from 10 grams of crushed dried flowers — about 5 teaspoons per 1 to 2 cups water — once a day). After four weeks, the herb had worked as well as the drug, with both groups showing an 11 percent drop in blood pressure.
- In another study, the same researchers gave 193 people either lisinopril, (Zestril, Prinivil; 10 milligrams per day) or hibiscus (250 milligrams in the form of a capsule). After four weeks, the herb had worked almost as well as the drug: Blood pressure decreased 15 percent among those on the drug, and 12 percent among those taking hibiscus.
How does hibiscus lower blood
pressure? Recent research suggests a combination of reasons: It has diuretic
properties, it opens the arteries, and it appears to act as a natural
angiotensin-converting enzyme (ACE) inhibitor, which means it slows the release
of hormones that constrict blood vessels. In addition, hibiscus boosts immune
function and provides valuable antioxidants.
Dose recommendations vary from about
1 teaspoon of dried “flowers” (technically, the calyxes
surrounding the flowers) per cup of boiling water up to the 5
teaspoons used in one of the Mexican studies. Steep five to 10 minutes. If you
have high blood pressure, you should own a home blood pressure monitor. Take
readings before different doses and retest an hour later to see what works best
for you. Check with your doctor prior to taking hibiscus if you’re currently on
medication to lower blood pressure — often a combination of an herb and a lower
dose of a pharmaceutical provides the same benefit.
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