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A type of algae, ecklonia cava delivers powerful antioxidant support—potentially more powerful than land-based sources like green tea or resveratrol. It is commonly found off the coasts of Asia, especially the Japanese and Korean ocean coasts. The active ingredients of ecklonia cava are unique polyphenols that deliver potent free radical defense. Swanson GreenFoods Ecklonia Cava is made with the purest extract form of algae available. The Swanson Premium Full Spectrum Ecklonia Cava is made with pure and whole ground algae.