ProPhase Labs, Inc. engages in the manufacture, marketing, and distribution of homeopathic and health products to the general public. It is also involved in the research and development of over-the-counter (OTC) drugs, natural base health products with supplements, personal care, and cosmeceutical products. The company offers Cold-EEZE, a zinc gluconate glycine lozenge to reduce the duration and severity of the common cold symptoms. It also markets and distributes two non-lozenge forms of its proprietary zinc gluconate formulation, Cold-EEZE daytime/nighttime QuickMelts and Cold-EEZE oral spray; and Kids-EEZE products for children suffering from upper respiratory infections, allergy, and/or chest congestion, as well as organic cough drops and a Vitamin C supplements. It also provides private label lozenge products for retail customers; and performs contract manufacturing services of cough drop and other OTC cold remedy products for third parties. ProPhase Labs, Inc. sells its products through food, multi-outlet pharmacy and chain drug stores, wholesalers, and mass merchandisers in the United States. The company was formerly known as The Quigley Corporation. ProPhase Labs, Inc. was founded in 1989 and is headquartered in Doylestown, Pennsylvania.