500 MG/80% Silymarin Maximum Guaranteed Potency Standardized Botanical Supplement Prescription Quality Gluten Free Vegetarian HerbaShieldNutritional support for healthy liver functionEach Herbal Actives extended-release formula provides rapid and sustained results. Supplying the greatest concentration of active botanical principles, Herbal Actives Milk Thistle maximizes the synergistic benefits of the whole seed.Guaranteed Maximum Potency: Each Herbal Actives formula is scientifically standardized to the highest level of active principles.HerbaShield: An exclusive purity and safety system including light-resistant bottle, airtight inner seal, moisture-absorbing packet, tamper-evident safety cap and tamper-proof full bottle seal.