Antioxidant Support. 400 mg Per Capsule. Herbal Supplement. Used Traditionally to Support Digestive and Nervous System Health. Traditional Chinese Herb. Full Spectrum® Whole Bark Formula. Science-Backed Quality Since 1969. The bark of the magnolia tree has a long history of use in traditional Chinese practices as the foundation for a variety of popular formulas supporting upper respiratory health. Our Swanson Full-Spectrum® Magnolia Bark capsules feature the same undiluted, whole bark powder used for centuries. Try it today. 60 Capsules per Bottle. Potent 400mg per Capsule.