Quercetin Plus Vitamin C

Quercetin Plus Vitamin C and 4 near-identical products are sold under 3 different brand names — a exact-twin Formula Twins cluster.

Product	Brand
Quercetin Plus Vitamin C	Vitamin World
Quercetin+C	The Vitamin Shoppe
Quercetin+C	The Vitamin Shoppe
Quercetin Dihydrate plus Vitamin C	Puritan's Pride
Quercetin Dihydrate plus Vitamin C	Puritan's Pride