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

    Saudi Arabia’s New Female Politicians in the Other Room 

    Many in Saudi Arabia say elected representatives should share unsegregated spaces; according to a recent survey, more than half the Saudi population, both men and women, prefer to work in a segregated place

    Russia Not ‘Apologetic’ for Syria Airstrikes

    With Moscow criticized for targeting armed opponents of President Assad, Russia’s UN envoy says his country ‘acting in a very transparent manner’

    Pakistan Warns of Islamic State's Growing Reach

    Aftab Sultan, General Director General of Intelligence Bureau (IB), briefed Senate Committee in closed hearing, saying that IS-linked groups have been expanding in Pakistan

    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.
    Russia's Car Sales Shrink Overall, But Luxury and Economy Models See Growthi
    X
    February 10, 2016 5:54 AM
    Car sales in Russia dropped by more than a third in 2015 because of the country's economic woes. But, at the extreme ends of the car market, luxury vehicles and some economy brands are actually experiencing growth. VOA's Daniel Schearf reports from Moscow.
    Video

    Video Russia's Car Sales Shrink Overall, But Luxury and Economy Models See Growth

    Car sales in Russia dropped by more than a third in 2015 because of the country's economic woes. But, at the extreme ends of the car market, luxury vehicles and some economy brands are actually experiencing growth. VOA's Daniel Schearf reports from Moscow.
    Video

    Video Civil Rights Pioneer Remembers Struggle for Voting Rights

    February is Black History Month in the United States. The annual, month-long national observance pays tribute to important people and events that shaped the history of African Americans. VOA's Chris Simkins reports how one man fought against discrimination to help millions of blacks obtain the right to vote
    Video

    Video Jordanian Theater Group Stages Anti-Terrorism Message

    The lure of the self-styled “Islamic State” has many parents worried about their children who may be susceptible to the organization’s online propaganda. Dozens of Muslim communities in the Middle East are fighting back -- giving young adults alternatives to violence. One group in Jordan is using dramatic expression a send a family message. Mideast Broadcasting Network correspondent Haider Al Abdali shared this report with VOA. It’s narrated by Bronwyn Benito
    Video

    Video Migrant Crisis Fuels Debate Over Britain’s Future in EU

    The migrant crisis in Europe is fueling the debate in Britain ahead of a referendum on staying in the European Union that may be held this year. Prime Minister David Cameron warns that leaving the EU could lead to thousands more migrants arriving in the country. Meanwhile, tension is rising in Calais, France, where thousands of migrants are living in squalid camps. VOA's Henry Ridgwell reports.
    Video

    Video Valentine's Day Stinks for Lebanese Clowns

    This weekend, on Valentine's Day in Lebanon, love is not the only thing in the air. More than half a year after the country's trash crisis began, the stink of uncollected garbage remains on the streets. Step forward "Clown Me In," a group of clowns who use their skills for activism. Before the most romantic day of the year the clowns have released their unusual take on love in Lebanon -- in a bid to keep the pressure up and get the trash off the streets. John Owens reports from Beirut.
    Video

    Video Families Flee Aleppo for Kurdish Regions in Syria

    Not all who flee the fighting in Aleppo are trying to cross the border into Turkey. A VOA reporter caught up with several families heading for Kurdish-held areas of northern Syria.
    Video

    Video Rocky Year Ahead for Nigeria Amid Oil Price Crash

    The global fall in the price of oil has rattled the economies of many petroleum exporters, and Africa’s oil king Nigeria is no exception. As Chris Stein reports from Lagos, analysts are predicting a rough year ahead for the continent’s top producer of crude.
    Video

    Video 'No Means No' Program Targets Sexual Violence in Kenya

    The organizers of an initiative to reduce and stop rape in the informal settlements around Kenya's capital say their program is having marked success. Girls are taking self-defense classes while the boys are learning how to protect the girls and respect them. Lenny Ruvaga reports from Nairobi.
    Video

    Video Chocolate Lovers Get a Sweet History Lesson

    Observed in many countries around the world, Valentine’s Day is sometimes celebrated with chocolate festivals. But at a festival near Washington, the visitors experience a bit more than a sugar rush. They go on a sweet journey through history. VOA’s June Soh takes us to the festival.
    Video

    Video 'Smart' Bandages Could Heal Wounds More Quickly

    Simple bandages are usually seen as the first line of attack in healing small to moderate wounds and burns. But scientists say new synthetic materials with embedded microsensors could turn bandages into a much more valuable tool for emergency physicians. VOA’s George Putic reports.
    Video

    Video Researchers Use 3-D Printer to Produce Transplantable Body Parts

    Human organ transplants have become fairly common around the world in the past few decades. Researchers at various universities are coordinating their efforts to find solutions -- including teams at the University of Pennsylvania and Rice University in Houston that are experimenting with a 3-D printer -- to make blood vessels and other structures for implant. As VOA’s Greg Flakus reports from Houston, they are also using these artificial body parts to seek ways of defeating cancerous tumors.
    Video

    Video Helping the Blind 'See' Great Art

    There are 285 million blind and visually impaired people in the world who are unable to enjoy visual art at a museum. One New York photographer is trying to fix this situation by making tangible copies of the world’s masterpieces. VOA correspondent Victoria Kupchinetsky was there as visually impaired people got a feel for great art. Joy Wagner narrates her report.
    Video

    Video German Artists to Memorialize Refugees With Life Jacket Exhibit

    Sold in every kind of shop in some Turkish port towns, life jackets have become a symbol of the refugee crisis that brought a million people to Europe in 2015.  On the shores of Lesbos, Greece, German artists collect discarded life jackets as they prepare an art installation they plan to display in Germany.  For VOA, Hamada Elrasam has this report from Lesbos, Greece.
    Video

    Video E-readers Help Ease Africa's Book Shortage

    Millions of people in Africa can't read, and there's a chronic shortage of books. A non-profit organization called Worldreader is trying to help change all that one e-reader at a time. VOA’s Deborah Block tells us about a girls' school in Nairobi, Kenya where Worldreader is making a difference.