Natural Factors - Bioactive Quercetin EMIQ - 60 Veggie Capsule(s) - NPN: 80051413 -- Enzymatically modified isoquercitrin (EMIQ) is a highly bioavailable form of quercetin a flavonoid that exerts significant anti-allergy effects. The limiting factor in quercetins clinical efficacy appears to be its poor bioavailability, so EMIQ by Natural Factors offers consumers a more efficacious product.