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Immune HealthHerbal SupplementTraditionally Used for Promoting Immune HealthHelps Support Healthy Intestinal FloraFull Spectrum® Inner-Bark FormulaScience-Backed Quality Since 1969Try this amazing Amazonian herb traditionally used to support our defenses! Found deep in the tropical rain forests of Brazil pau d'arco has unique compounds in its bark that work to reinforce the body's defense mechanisms. Swanson Full Spectrum Pau d'Arco convenient capsules supply 500 mg of pure pau d'arco inner bark.