When you need to shine and be at your best, you can't afford to feel under the weather. There's no time like the present for some serious immune system support. Certain key antioxidant ingredients can help! Quercetin, a hardworking flavonoid, may help support the proper balance of histamine in the body for sinus and respiratory comfort. Bromelain, a plant enzyme naturally found in pineapples, may help provide healthy sinus and immune system support, while vitamin C's powerful antioxidant content makes it the perfect addition to any immune health supplement. Solaray QBC Plex is lab tested for identity, purity and potency. You can always expect the highest quality from Solaray and this product is no exception. Our QBC Plex brings together all three ingredients in a synergistic blend that will keep you feeling bright, healthy and vibrant all year long. It just works better, so you can Live Brighter!