2 X Vitacost, Synergy�, Advan-C� Including Quercetin & Citrus Bioflavonoid Comp
What is Advan-C® with Quercetin and Citrus Bioflavonoids Advan-C® with Quercetin and Citrus Bioflavonoids is a synergistically formulated combination of a gentler form of vitamin C plus citrus bioflavonoids and quercetin.