Vitals Milk Thistle PS (60 capsules) contains Siliphos®, a high-quality milk thistle extract. Milk thistle, known for the white spots on its leaves associated with an ancient legend, is an herb with a long history. The seeds of milk thistle are used for their valuable constituents, including silybin, the main active ingredient. This formula uses Phytosome® technology to enhance the absorption of silybin by combining it with phosphatidylcholine.