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Detoxification SupportFeatures 80% SilymarinStandardizedHerbal SupplementBoosts Antioxidant ActivitySupports Detoxification in the LiverSupports Healthy Liver Spleen and Kidney FunctionScience-Backed Quality Since 1969Nature's premier herbal liver tonic Swanson Milk Thistle features a powerful antioxidant flavonoid known as silymarin which has specific protective benefits for liver tissues. Our convenient capsules combine 250 mg of guaranteed- potency milk thistle (standardized to 80 percent silymarin) with 250 mg of milk thistle powder.