Best-selling supplement ALLER-C® is a potent and effective combination formula designed to help maintain normal respiratory and sinus function.* Aller-C features Isoquercitrin, a clinically studied nutraceutical offering the benefits of quercetin with superior absorption and bioavailability, to help promote cellular antioxidant defenses and a normal histamine response.* Aller-C’s combination formula also includes Vitamin C for immune support, Citrus Bioflavonoids to help maintain capillary stability, and Bromelain to promote inflammatory balance.* This supplement can be used for maintaining and supporting the proper levels of enzymes and physiological factors necessary for normal respiratory and sinus function during seasonal challenges.* Approved for sale in Canada. Packaging and labels may vary.