News / Health

Popular Supplement Fails to Lower Blood Pressure

New tests dispute prior findings of studies on pine bark extract

Multimedia

Audio
Art Chimes

Previous research has shown an array of benefits from taking pine bark extract, but a new study questions that.
Previous research has shown an array of benefits from taking pine bark extract, but a new study questions that.

A new study of a popular dietary supplement indicates that, while pine bark extract is safe, it has no significant effect on blood pressure or other risk factors for heart disease. This new research seems to contradict evidence from earlier studies.

Previous research has shown an array of benefits from taking pine bark extract, ranging from reducing inflammation to treating skin disorders and menstrual symptoms. It is reported to have antioxidant properties and to help lower blood pressure, as well.



To test out some of the claims, Stanford University researcher Randall Stafford and colleagues recruited people who were overweight and had blood pressure slightly higher than normal — in other words, people likely to try a dietary supplement rather than expensive prescription drugs.

People in the study were randomly assigned to either take pine bark extract or a look-alike placebo.

After 12 weeks, the researchers found essentially no benefit from the supplement.

"We in fact found no difference between the pine bark extract group and the placebo group," said Stafford. "There were very small changes in blood pressure. And in fact, there was a slightly greater reduction in blood pressure among the placebo group, but it was a change that could have easily been explained by random chance."

Stafford says the results were surprising, because previous studies had shown some cardiovascular benefit. But he noted that there were problems with the methodology in the earlier studies, which were not placebo-controlled, double-blind trials like his was.

Also, products sold as "pine bark extract" can be made in a variety of ways and are not all the same, since these sorts of nutritional supplements are only loosely regulated, at least here in the U.S.

"There are a number of different pine bark extracts out on the market. They are extracted or derived in different ways. It is possible that other pine bark might have benefits where this one doesn't," he said.

In the United States and many other countries, government officials don't require natural dietary supplements to be proven safe and effective, the way other drugs are.

Stafford says his study illustrates how flimsy the scientific basis is for claims made by sellers of and advocates for many different supplements.

"Much of the expenditure on dietary supplements are for products that really don't have rigorous data supporting their use."

The study by Stanford researcher Randall Stafford and colleagues is published in the American Medical Association journal, Archives of Internal Medicine.

You May Like

Conflicts Engulf Christians in Mideast

Research finds an increase in faith-based hostilities, and Christians are facing persecution in a growing number of countries in the region More

Chinese Americans: Don’t Call Us 'Model Minority'

Label points to collective achievement, but some say it triggers resentment, unrealistic expectations More

Iran Bolsters Phone, Internet Surveillance

Does increased monitoring suggest the government is nervous? More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
West Africa Ebola Vaccine Trials Possible by Early 2015i
X
Carol Pearson
August 30, 2014 7:14 PM
A U.S. health agency is speeding up clinical trials of a possible vaccine against the deadly Ebola virus that so far has killed more than 1,500 people in West Africa. If successful, the next step would be a larger trial in countries where the outbreak is occurring. VOA's Carol Pearson has more.
Video

Video West Africa Ebola Vaccine Trials Possible by Early 2015

A U.S. health agency is speeding up clinical trials of a possible vaccine against the deadly Ebola virus that so far has killed more than 1,500 people in West Africa. If successful, the next step would be a larger trial in countries where the outbreak is occurring. VOA's Carol Pearson has more.
Video

Video Survivors Commemorate 70th Anniversary of Nazi Liquidation of Polish Ghetto

When the Nazi army moved into the Polish city of Lodz in 1939, it marked the beginning of a long nightmare for the Jewish community that once made up one third of the population. Roughly 200,000 people were forced into the Lodz Ghetto. Less than 7,000 survived. As VOA’s Kane Farabaugh reports, some survivors gathered in Chicago on the 70th anniversary of the liquidation of the Lodz Ghetto to remember those who suffered at the hands of the Nazi regime.
Video

Video Cost to Raise Child in US Continues to Rise

The cost of raising a child in the United States continues to rise. In its latest annual report, the U.S. Department of Agriculture says middle income families with a child born in 2013 can expect to spend more than $240,000 before that child turns 18. And sending that child to college more than doubles that amount. VOA’s Deborah Block visited with a couple with one child in Alexandria, Virginia, to learn if the report reflects their lifestyle.
Video

Video Chaotic Afghan Vote Recount Threatens Nation’s Future

Afghanistan’s troubled presidential election continues to be rocked by turmoil as an audit of the ballots drags on. The U.N. says the recount will not be completed before September 10. Observers say repeated disputes and delays are threatening the orderly transfer of power and could have dangerous consequences. VOA correspondent Meredith Buel reports.
Video

Video Ukraine Battles Pro-Russia Rebel Assault

After NATO concluded an emergency meeting to discuss the crisis in eastern Ukraine, the country is struggling to contain heavy fighting near the strategic port of Mariupol, on the Azov Sea. Separatist rebels are trying to capture the city, allegedly with Russian military help, and Ukraine's defense forces are digging in. VOA's Daniel Schearf spoke with analysts about what lies ahead for Ukraine.
Video

Video Growing Business Offers Paint with a Twist of Wine

Two New Orleans area women started a small business seven years ago with one thing in mind: to help their neighbors relieve the stress of coping with a hurricane's aftermath. Today their business, which pairs painting and a little bit of wine, has become one of the fastest growing franchises across the U.S. VOA’s June Soh met the entrepreneurs at their newest franchise location in the Washington suburbs.
Video

Video Ebola Vaccine Trials To Begin Next Week

The National Institutes of Health says it is launching early stage trials of a vaccine to prevent the Ebola virus, which has infected or killed thousands of people across West Africa. The World Health Organization says Ebola could infect more than 20,000 people across the region by the time the outbreak is over. The epidemic has health experts and governments scrambling to prevent more people from becoming infected. Zlatica Hoke has more.
Video

Video Asian Bacteria Threatens Florida Orange Trees

Florida's citrus fruit industry is facing a serious threat from a bacteria carried by the Asian insect called psyllid. The widespread infestation again highlights the danger of transferring non-native species to American soil. VOA’s George Putic reports.
Video

Video Aging Will Reduce Economic Growth Worldwide in Coming Decades

The world is getting older, fast. And as more people retire each year, fewer working-age people will be there to replace them. Bond rating agency Moody’s says that will lead to a decline in household savings; reducing global investments - which in turn, will lead to slower economic growth around the world. But experts say it’s not too late to mitigate the economic impact of the world’s aging populations. Mil Arcega has more.
Video

Video Is West Doing Enough to Tackle Islamic State?

U.S. President Barack Obama has ruled out sending ground troops to Iraq to fight militants of the so-called Islamic State, or ISIS, despite officials in Washington describing the extremist group as the biggest threat the United States has faced in years. Henry Ridgwell reports from London on the growing uncertainty over whether the West’s response to ISIS will be enough to defeat the terrorist threat.
Video

Video Coalition to Fight Islamic State Could Reward Assad

The United States along with European and Mideast allies are considering a broader assault against Islamic State fighters who have spread from Syria into Iraq and risk further destabilizing an already troubled region. But as VOA State Department Correspondent Scott Stearns reports, confronting those militants could end up helping the embattled Syrian President Bashar al-Assad.
Video

Video Made in America Socks Get Toehold in Online Fashion Market

Three young entrepreneurs are hoping to revolutionize the high-end sock industry by introducing all-American creations of their own. And they’re doing most of it the old-fashioned way. VOA’s Julie Taboh recently caught up with them to learn what goes into making their one-of-a-kind socks.
Video

Video Americans, Ex-Pats Send Relief Supplies to West Africa

Health organizations from around the world are sending supplies and specialists to the West African countries that are dealing with the worst Ebola outbreak in history. On a smaller scale, ordinary Americans and African expatriates living in the United States are doing the same. VOA's Carol Pearson reports.

AppleAndroid