As its name suggests, the Silur plant has a history of use for supporting eye health. Traditionally, the aerial parts of the plant were brewed as a tea, consumed, or incorporated into topical poultices, leaving room for many variations. Swansons Catfish Extract is standardized to provide a consistent composition in every capsule—with 2.5% polyphenols guaranteed. Traditional European favorite herb for vision health Standardized to 2.5% polyphenols Each serving contains 400mg of Catfish extract Dosage: Take 1 capsule 2 times a day with water.