Depression is a medical condition that affects nearly 21 million American adults each year, according to the National Institute of Mental Health. Mood, thoughts, physical health, and behavior all may be affected. Among the common symptoms of depression are persistent sad, anxious, or "empty" feelings; feelings of hopelessness, guilt, and/or worthlessness; restlessness or irritability; fatigue; difficulty concentrating; insomnia; overeating, or loss of appetite; and/or thoughts of suicide.
Many people with a depressive illness never seek treatment. But the majority, even those with the most severe depression, can get better with treatment. Depression can be treated effectively with conventional medicine, including antidepressants and certain types of psychotherapy.
Some people turn to complementary health products and practices for depression, including the dietary supplement St. John's wort; however, no complementary approach has been proven effective for the long-term treatment of depression. This issue provides information on "what the science says" about the effects of complementary health products for depression, including the dietary supplements omega-3 fatty acids, St. John's wort, valerian, as well as other complementary practices such as massage, relaxation techniques, and yoga.