With a long history of traditional use, milk thistle has been shown to support liver health and aid healthy digestive processes. Organic milk thistle (Silybum marianum) capsules contain 400 mg of the ground seed in powder form. Milk thistle is a tall herb, often growing up to 2 meters tall, that has distinctive purple flower heads, prickly leaves and a milky sap. It is often found growing wild in the Middle East, North Africa and Southern Europe. How to use Take 1 to 3 capsules daily with meals.