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St John's wort
St. John's wort is a long-living plant with yellow flowers whose medicinal uses were first recorded in ancient Greece. It contains many chemical compounds. Some are believed to be the active ingredients that produce the herb's effects, including the compounds hypericin and hyperforin.
Preliminary studies suggest that St. John's wort might work by preventing nerve cells in the brain from reabsorbing the chemical messenger serotonin, or by reducing levels of a protein involved in the body's immune system functioning. St. John's wort has been used over the centuries for mental conditions, nerve pain, and a wide variety of other health conditions.
Today, St. John's wort is used for anxiety, mild to moderate depression, and sleep disorders. In Europe, St. John's wort is widely prescribed for depression. In the United States and Canada, there is public interest in St. John's wort as a treatment for depression, but it is not a prescription medicine.
In the United States and Canada, St. John's wort products are sold mainly as capsules, tablets, teas, and liquid extracts where specific types of chemicals are removed from the herb, leaving the desired chemicals in a concentrated form.
Scientific evidence co-funded by the National Center for Complementary and Alternative Medicine (NCCAM) and two other components of the National Institutes of Health (NIH), the National Institute of Mental Health and the Office of Dietary Supplements regarding the effectiveness of St. John's wort for depression is inconsistent. An analysis of the results of thirty-seven clinical trials concluded that St. John's wort may have only minimal beneficial effects on major depression. However, the analysis also found that St. John's wort may benefit people with minor depression but these benefits may be similar to those from standard antidepressants. Overall, St. John'本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。