Elderberry Supplements are produced from berries of several species of Elderberry tree (Sambucus spp.), most commonly Black Elderberry (Sambucus nigra). The Elderberry plant has been used for centuries by traditional healers to treat respiratory infections and other diseases. Elderberry is occasionally used in the Naturopathic treatment of acne.
Elderberry extracts have been reported to have antibacterial, antiviral and antioxidant properties. There have been some research reports that Elderberry extracts can decrease symptoms of respiratory infections, but the overall evidence is weak. Elderberry extracts have also been reported to have moderate antibacterial activity towards gram positive bacteria, a group which includes the acne-causing P. acnes bacterium.
In regards to acne, Elderberry extracts are often used for their perceived immune boost. The immune benefit may then lead to an improvement in acne symptoms. However, there does not appear to be any reliable evidence that indicates Elderberry extracts are an effective acne treatment when used orally or topically.
Elderberry @ Wikipedia
European elderberry (Sambucus nigra L.) rich in sugars, organic acids, anthocyanins and selected polyphenols. Veberic, et al. 2009.
Inhibitory activity of a standardized elderberry liquid extract against clinically-relevant human respiratory bacterial pathogens and influenza A and B viruses. Krawitz, et al. 2011.
Advanced research on the antioxidant and health benefit of elderberry (Sambucus nigra) in food–a review. Sidor, et al. 2015.
The antimicrobial activity of elderberry (Sambucus nigra L) extract against gram positive bacteria, gam negative bacteria and yeast. Mohammadsadeghi, et al. 2013.
Antibacterial activity of elder (Sambucus nigra L.) flower or berry against hospital pathogens. Hearst, et al. 2010.