Immune 5 Booster Boasts: N-acetylcysteine (NAC). from detoxification to brain health, to heart health, to fertility, NAC is a jack of all trades. Vitamin C is needed to maintain the health of skin, cartilage, teeth, bone, and blood vessels. It is also used to protect your body’s cells from damage. It is known as an antioxidant. Quercetin has antioxidant properties. Antioxidants work to protect the body from free radicals. Free radicals are unstable molecules in the body that can increase the risk of disease and quicken aging. Vitamin D3 is a fat soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of Vitamin D, calcium and phosphorus is important for building and keeping strong bones. Zinc Citrate is vital for many aspect of health and has been associated with a variety of benefits. Of course, these natural nutrients are profoundly responsive against many illnesses caused by viruses and bacteria.