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The study “provides preliminary evidence that milk thistle may be a safe, effective, supportive-care agent,” the researchers concluded in an online report in Cancer.

“Milk thistle needs to be studied further, to see how effective it is for a longer course of treatment, and whether it works well in reducing liver inflammation in other types of cancers and with other types of chemotherapy,” Kelly said in a press release issued by the American Cancer Society, publisher of Cancer. “However, our results are promising as there are no substitute medications for treating liver toxicity.”