NOW Foods Silymarin 2X 300 mg - 50 Vegetarian Capsules Now Foods Silymarin (Silybum marianum) is also known as Milk Thistle. Now Foods Silymarin is an herb that is well-documented in early traditonal herbal medicine. Studies abroad and in the U. S. have indicated that constituents in Now Foods Silymarin may help to support healthy liver function. This seal certifies that the.