TwinLab Quercetin + C, with Corn-Free Vitamin C, Capsules, 50 capsules

What the brand says

Dietary supplement. Hypoallergenic. Citrus free. Quercetin + C is a revolutionary, synergistic combination of Quercetin, a non-citrus bio-active bioflavanoid, and corn-free Vitamin C. Quercetin is unique in that it is more potent than common bioflavanoid complexes and contains no citrus allergens.