Give your immune system the support it needs. Quantum Health has a 40 plus year history of providing effective immune support products. CDZ delivers the combined immune supporting power of Vitamin C, Vitamin D3, and Zinc in one easy to swallow capsule. Each capsule is formulated with: Vitamin C 500 mg – Also known as Ascorbic Acid, this powerful antioxidant is also a crucial nutrient for supporting a healthy immune system. Additionally, Vitamin C helps with collagen production, supports cardiovascular health, and helps the body to absorb iron. Vitamin D3 1000 IU – Vitamin D3 is important for maintaining immune health, bone health, brain health, and cardiovascular health. Zinc 15 mg – Not only is Zinc critical for supporting the immune system, but it is also important for many other bodily functions, including eye health, skin health, and reproductive health.