* Formula based on research published by the National University of Natural Medicine in Portland, Oregon showing support for seasonal conditions * Seasonal & environmental support product * Vitamin C supports the immune system Give your immune system the support it needs to stay balanced. Antioxidant Vitamin C is necessary for proper immune function, while the potent flavonoid quercetin helps to modulate immunity. Soothing magnesium, the enzyme bromelain and stinging nettle leaf help to keep the immune system on an even keel. Because more isn't always better. You can relax, knowing your immune system is balanced with Quercetin/Nettle Plus.