Combining the antioxidant power of up to four key helpers delivered in convenient powder packets with zero grams of sugar per serving, Vitamin C-PAK and Vitamin C-PAK with Quercetin provide ideal servings of all-day immune support every time.* – Support your first line of defense against everyday threats with our Vitamin C-PAK with Quercetin, an immune system supporter packed with vitamins you need to stay in tip-top shape year round – This blend provides 3 essential, immune-supporting nutrients Vitamin C, Vitamin D and Zinc plus Quercetin Phytosome Complex, an antioxidant that works with Vitamin C and Zinc to greatly enhance bioavailability* – Each packet delivers 500 mg of Vitamin C in a natural, orange-flavored powder that easily dissolves in water for a lightly fizzy drink with fast-acting absorption* – Following Dr. Mercolas belief in providing the best quality products, these convenient, on-the-go packets are shelf-stable, contain 0 g of sugar per serving and are free of GMOs, gluten, and soy – Developed with you in mind, Dr. Mercolas physician formulated products are only made with ingredients that meet our premium quality standards. Established in 1997, we have been a trusted source in natural health for over two decades