Vitamin C contributes to normal collagen formation for the normal function of teeth and skin and bones and contributes to the normal function of the immune system. Eat a healthy variety of differently coloured vegetables and fruits each day - at least 5 portions. A smooth & refreshing drink of pure squeezed orange juice, made from sweet & juicy oranges. We've squeezed 12 oranges per carton. 150ml makes up 1 of your 5 a day.