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Antioxidant Support500 mg Per CapsuleCitrus Bioflavonoid Herbal SupplementTotal Wellness for Mind Body & HomeUnsurpassed Purity & Potency Science-Backed Quality Since 1969Swanson Naringin is a beneficial glycoside flavonoid concentrated from grapefruit peel. Naringin gives grapefruit its characteristic bitter flavor and works synergistically with vitamin C to pump up cellular defenses. Each of our capsules offers more naringin than you would drink in one 16 oz. glass of fresh grapefruit juice—and with no bitter flavor! There's no better value choice than our Naringin for a great addition to your wellness regimen.