Natural Factors Premium Milk Thistle Siliphos Phytosome - Contains the most bioavailable form of Silybin, a flavonoid that unlocks milk thistle’s main health benefits. Milk thistle supports healthy liver function, contains antioxidants to protect liver cells from free radical damage, helps maintain normal glutathione levels, strengthens liver cell membranes and complements cleanses and detoxification regimes naturally. Using a proprietary Phytosome technology that binds milk thistle extract to phosphatidylcholine to aid absorption.