A new study suggests herbal medicine may be linked to increased risk of developing a rare form of brain cancer.
A new study found that people who took at least four herbal medicines during the year before they developed cancer were three times more likely to have the disease in the following year, the New York Times reported.
Researchers at the University of Wisconsin-Madison looked at information from more than 15,000 people who were diagnosed with cancer, and found that those who took three or more herbal medicines were four times more than those who did not.
The researchers did not find any association between the use of any herb and cancer risk.
The study also found that the more people took the drugs, the higher the risk.
There are more than 2,000 herbs and botanical products that are used in the United States, according to the National Center for Complementary and Alternative Medicine.
Many of these herbs and products are listed on the Food and Drug Administration’s (FDA) list of botanical substances, but the FDA has not included the herbal compounds on its list of approved drugs.
Dr. Mark Wahlstrom, the lead author of the study, told the Times that it’s difficult to know exactly how many people were using the herbal medicines and the likelihood of developing the disease.
However, the research suggests that people taking herbal medicines may be more likely than other people to develop the disease, Wahlstrums said.
He said there is a lot of research to be done to better understand the risks of herbal medicines, including their safety.