Dedication to excellence, innovation and satisfaction Resealable, light-proof, foil-fresh pouch packaging. Vitamin C is a vital nutrient serving many purposes within the body, contributing to the protection of cells from oxidative stress, towards normal psychological function, immune system and nervous system function, the maintenance of normal collagen formation for the normal function of blood vessels, bones, teeth, gums and cartilage, normal energy-yielding metabolism and the reduction of tiredness and fatigue. The body regularly excretes Vitamin C and so it needs constant replenishment.