All Natural Black Elderberry Extract and Rose Hip Extract Dietary Supplement Immune System Booster Kosher Elderberries are unusually rich in flavonoids that act as powerful antioxidants to boost the immune system. Yum V's Immune Shield's primary active ingredient as sambucus, commonly known as elderberry. Elderberry extract contains a special class of flavonoids called anthocyanins that are recognized for their role in stimulating the body's immune system response. Yum V's Immune Shield also contains Rose Hip Extract which is loaded with Vitamin C and helps strengthen the immune system. Yum-V's Immune Shield has the properties of sambucus in a great tasting jelly.