The immune system is a complex network of organs and cells that work together to protect the body. Immune cells are found in different parts of the body, including the skin, mouth, nose and lungs. They also live in blood vessels throughout your body. Ecz Drops with Zinc, Vitamin C and Elderberry supplement provides essential minerals for optimal immune system function. The product is rich in antioxidants that helps protect the body from damaging free radicals.