However, unrefined plant preparations contain variable levels of the active compound as well as many irrelevant, potentially harmful substances. Preparations that have been claimed to have benefit to CFS patients include astralagus, borage seed oil, bromelain, comfrey, echinacea, garlic, Ginkgo biloba , ginseng, primrose oil, quercetin, St. John's wort, and Shiitake mushroom extract. Only primrose oil was evaluated in a controlled study, and the beneficial effects noted in CFS patients have not been independently confirmed. Some herbal preparations, notably comfrey and high-dose ginseng, have recognized harmful effects. Get Your Medifocus Medguide Research Your Illness Visit our Medcenter and get your Medifocus Guide , trustworthy medical information specifically about your health condition.
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