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Antioxidant Support400 mg Per CapsuleHerbal SupplementA Source of Antioxidants for Cardiovascular HealthFull Spectrum® Whole Leaf FormulaScience-Backed Quality Since 1969Swanson Olive Leaf is a great way to promote a healthy immune system. The plant's leaf contains a unique compound called oleuropein which works to bolster the body's defenses. It's also a potent antioxidant. Each capsule delivers 400 mg of olive leaf.