Jestli umíš anglicky, tak zde For most people who take echinacea over the short term, the herb is relatively safe and non-toxic. However, some may experience allergic reactions. Individuals who may be allergic to echinacea include those with a history of asthma or rhinitis and allergy to members of the daisy family. In these cases, echinacea is best avoided.

Echinacea should not be taken by people with auto-immune diseases, including lupus, multiple sclerosis and collagen disorders. This is due to the nonspecific stimulatory effect that echinacea has on the immune system; it can worsen symptoms of the disease.

Individuals with tuberculosis or who are HIV-positive should also avoid taking the herb, because their decreased immune capabilities may be more rapidly depleted with over stimulation.

Additionally, persons on immunosuppressive drugs like corticosteroids or cyclosporin, are cautioned against the use of echinacea. Corticosteroids and cyclosporin are drugs commonly used after organ transplants and with lupus. Using echinacea with immunosuppressive drugs counters their effect, possibly resulting in severe illness.

Long-term use of echinacea has been associated with toxicity to the liver. Hence, it should never be taken with other drugs that are also toxic to the liver, such as anabolic steroids, amiodarone, methotrexate or ketoconazole. This area of drug-herb reaction is not completely understood; therefore, the best approaches are to avoid habitual use of echinacea and to discuss its use thoroughly with one"s physician.

Četla jsem těch článků na tohle téma víc, samozřejmě výrobci doplňků přinesli vlastní studie, podle kterých toxická není, ale věřím raději těm nezávislým studiím.