Elderberry extract's benefits on human body Influenza prevention elderberry has anti-inflammatory, antiviral and improve immunity. Especially for the heat type of wound airflow nose water, drink a cup of thick elderberry tea can effectively relieve nasal congestion, and help reduce nasal sinus mucosa, accelerate the complex. In addition, black elderberries are effective in improving cough, cold, flu, bacterial and viral infections and tonsillitis, among other flu symptoms.