聖約翰草的主要作用？
聖約翰草能有效緩解輕度至中度抑鬱癥，以及焦慮和失眠等癥狀。美國國立衛生研究所指出聖約翰草提取物能“改善情緒、降低焦慮和抑鬱癥相關失眠癥狀”，在短期治療輕度抑鬱癥效果與是許多處方藥物相若。
聖約翰草也有其他作用。英國一項研究發現，聖約翰草有效治療婦女輕度經前綜合徵的生理和行為癥狀。西班牙一些研究人員得出結論，聖約翰草所具有的抗氧化性能可減帕金森氏癥所引起的神經元病變。
聖約翰草是如何產生作用的？
聖約翰草含有一個稱為金絲桃素(Hypericin)的主要成分，能增加身體神經遞質血清素和褪黑激素水平，幫助睡眠和調節情緒。聖約翰草所含的另一成分Hyperforin能有效增加神經遞質在體內的作用時間，從而有助於穩定情緒。
St. John’s Wort
St. John’s wort (Hypericum perforatum) has long been used to treat depression and related conditions.
What does it treat?
St. John’s wort is most commonly associated with the relief of mild to moderate depression, as well as anxiety and sleeplessness. The National Institutes of Health notes that the extract “improves mood, and decreases anxiety and insomnia related to depression,” and is as effective as many prescription drugs in the short-term treatment of mild depression.
It has other applications as well. A British study found St. John’s wort promising in treating the physical and behavioral symptoms of women diagnosed with mild premenstrual syndrome. Researchers in Spain concluded that St. John’s wort, because of its antioxidant properties, may reduce the degeneration of neurons caused by Parkinson’s disease.
How does it work?
Hypericin, a component of St. John’s wort, increases the amount the body can metabolize of the neurotransmitter serotonin and the sleep-regulating hormone melatonin. Hyperforin, also found in the herb, helps keep neurotransmitters working longer in the body, thus contributing to emotional stability.
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