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Antioxidant Support500 mg Per TabletGreen Foods FormulaDietary SupplementConsidered a Superfood Spirulina Blue-Green Algae is Packed with NutrientsBoosts Antioxidant ActivitySupports Toxin RemovalScience-Backed Quality Since 1969This blue-green algae is a tremendous whole food featuring the antioxidant support of beta-carotene and phycocyanin a free radical fighting antioxidant. Swanson Spirulina delivers 500 mg of this nutrient-rich green food in a single-tablet serving. Spirulina also has protein amino acids minerals including iron B vitamins and cleansing chlorophyll.