This is the VOA Special English Science Report. American researchers say a new study has found that a substance made from the plant known as Saint John s wort is not effective in treating serious depression.
Depression is a feeling of deep sadness that continues for at least fourteen days.
People who are depressed may have decreased energy, feelings of guilt or thoughts of killing themselves. They may experience changes in how much they eat or sleep. They may be unable to work or care for their families. Some kinds of depression are more severe than others. Saint John s wort has become very popular in the United States to treat depression.