Bioconcepts milk thistle 125mg milk thistle is a thistle of the genus silybum a plant from the daisy family the thistle is native to the mediterranean regions of europe north africa and the middle east its name comes from from a feature of the leaves which are notably banded with splashes of white the seeds of the milk thistle plant contain a flavonoid referred to as silymarin silymarin is believed to be responsible for the medical health benefits of the plant it is made up of 3 constitu