What Are the Health Benefits of Elderberry?

I spoke to Runner’s World about the elderberry and its reputation as an immunity booster:

Elderberry is a dark purple berry that comes from the European elder tree. The berries are tart in flavor and need to be cooked to be eaten, which is why most products that tout the ingredient are in the form of syrups, extracts, gummies or tablets. Elderberry has been used in traditional medicines throughout history, most notably for its properties to help with cold and flu symptoms, says Feller.