Cross biopharm Immunity Vitamin C + D + Zinc 3 x 90 capsulesCross Vitamin Immunity combines the three most important elements for your body, namely vitamin C, D and zinc. Vitamin C is the basic building block of the immune system, which also acts as an antioxidant. It is responsible for the production of collagen, which is important for blood vessels, healthy teeth and gums. The human organism cannot create it itself and therefore it depends on its intake from various sources. Vitamin D is important for muscle