NATURE'S FIELD VITAMIN C 1500MG X60 contribute to the maintenance of normal immune function during and after intense physical exercise. Contribute to normal collagen formation which is essential for normal function of blood vessels, bones, cartilage, skin, gums and teeth.Maintain efficient energy-yielding metabolism. Contribute to normal function of the nervous system. Important for normal psychological function. Contribute to the protection of cells from oxidative stress.