Balanced Immune System Supports Healthy Seasonal Immune Function A Dietary Supplement Vegetarian - Vegan Kosher General Health Family Owned Since 1968 GMP Quality AssuredQuercetin is naturally occurring free radical scavenger that supports healthy seasonal immune system function. Laboratory studies have demonstrated that Quercetin can also help to promote normal respiratory function. Bromelain supports a balanced immune system and may also help to maintain healthy sinus tissues. This complementary combination may thus promote year-round respiratory healthy and support overall seasonal comfort.