Elderberry studies American vs European elderberries Toxicity of American elderberries Elderberry and Elderflower Extracts, Phenolic Compounds, and Metabolites and Their Effect on Complement, RAW 264.7 Macrophages and Dendritic Cells Advanced research on the antioxidant and health benefit of elderberry (Sambucus nigra) in food – a review Randomized study of the efficacy and safety of oral elderberry extract in the treatment of influenza A and B virus infections