Elderberries are high in antioxidants, which have often been shown to help our immune systems overcome illness. Increasingly, the extracts of elderberries are marketed in products that claim to boost your immune system. Marketing for one elderberry supplement indicated that it would reduce the duration of your cold and lessen your symptoms. A double-blind, randomized controlled trial indicated that elderberry treatment did not prevent cold virus infections, but people who took elderberry had less severe symptoms that lasted for a shorter time period. Is the marketing claim based on science or pseudoscience? science pseudoscience