Immune Health Herbal Supplement Provides Immediate Support For Immune Challenges Supports Immune Health Full Spectrum® Whole Root Formula Science-Backed Quality Since 1969 Bolster your immune system and revitalize your entire body with Swanson Full Spectrum® Astragalus Root! Valued for over 2,000 years by traditional Chinese herbalists as an energizing tonic or "chi" herb, astragalus is now used primarily as an immune system booster and for promoting cardiovascular and liver health. Our convenient capsules contain 470 mg of pure astragalus root.