This is a powerful health promoting combination of vitamin C, Quercetin and zinc. Vitamin C is an antioxidant which has a major impact on oxidative stress. Quercetin helps zinc get into the cells at higher levels, and higher levels of zinc can stop viruses from replicating in a similar way to NAC. Zinc helps with making stomach acids, aiding with digestion. Zinc also plays a major role in making hormones such as testosterone. 60 capsules.