Zinc is an essential trace element, that is nutritionally required. There is a great deal of data on both Zinc deficiency as well as Zinc excess. This are discussed in detail, and is provided in Virmunity primarily do to studies demonstrating its effect on reducing the duration of the common cold.*
N-acetylcysteine (NAC) is an amino acid and antioxidant. It is required for the synthesis of the body’s strongest known antioxidant, glutathione (GSH). NAC has been shown to decrease phlegm and respiratory mucous, and is used to treat chronic respiratory conditions.