Milk Thistle (Silybum marianum) is a supplement that helps maintain healthy liver function. An active part of an extract from milk thistle, known as silybin, and has been shown to support liver function by helping maintain a healthy oxidative balance. The dose of compounded Milk Thistle is labeled as the total amount of Milk Thistle as silymarin, which contains approximately 30% silybin. For example, one 100-mg capsule contains 100mg of silymarin, equivalent to approximately 30mg of silybum. Milk Thistle Compounded capsule is a blue and white elongated capsule made specifically for your pet.