Black elderberry (Sambucus nigra) has traditionally been used to treat cold and flu symptoms. Elderberries contain a variety of flavones, isoflavones, flavanols, anthocyanins, phenolic acids, lectins, and many vitamins. The active chemicals include anthocyanins.

These immune-boosting compounds are antiviral, antibacterial, anti-diabetic, antitumor, antioxidant and antidepressant.

The antiviral properties include activity against coronaviruses and influenza viruses. The active compounds attach to H1N1 cells and stop them from entering our cells.