Cat's Claw Bark Una de Gato Supports Immune System Cat's claw bark (Uncaria tomentosa) is a rain forest herb used by indigenous Peruvians for centuries, dating back to the ancient Incas. The inner bark contains unique active constituents to help support the body’s immune system.* The bark can be obtained without needless destruction of the plant.* 500 mg Tablet Option Available: 30, 60, 120 Suggested Use: 1 to 2 tablets twice daily. Allergies: Contains no yeast, dairy, egg, gluten, corn, soy, or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.