Milk Thistle Plus from Seroyal's Genestra Brands is formulated with the seed and seed extract from milk thistle (Silybum marianum). This herb contains silymarin, which is a flavonoid complex that is believed to have liver protective properties. The antioxidant works in the body to protect cells from free radical damage, promote glutathione production and a healthy internal response, and discourage toxin uptake. The Milk Thistle Plus formula seeks to support healthy liver function.