Milk thistle is a flowering plant that comes from the same family of plants as the daisy. It grows in Mediterranean countries and is used to make natural remedies. Milk thistle is also known as Silybum marianum. This prickly plant has distinctive purple flowers and white veins, which traditional stories say were caused by a drop of the Virgin Mary's milk falling onto its leaves. The active ingredients in milk thistle are a group of plant compounds collectively known as silymarin.
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