Supports Immune System Promotes Healthy Immune Function Support for Seasonal Changes A Dietary Supplement General Health Family Owned Since 1968 GMP Quality AssuredEach lozenge of NOW Elderberry & Zinc is an Elderberry Concentrate formulated with Zinc and Vitamin C. Zinc is a trace mineral that plays a critical role in immune system function. Echinacea, Propolis and Slippery Elm have been added to complement this unique formula.