Vitamin C boosts the immune system by strengthening the action of white blood cells that destroy harmful bacteria and viruses, such as cold and flu viruses. It is also an important antioxidant, protecting the watery internal parts of cells from the damaging effects of excess free radicals, and it works in partnership with vitamin E which protects the fatty outer part of the cells. Moreover, vitamin C can help to prevent cholesterol from becoming oxidised, a phenomenon now thought to be the precursor to the furring of arteries – the reduction of blood flow through arteries. High intakes of vitamin C are also linked with lower levels of stomach cancer. In addition, vitamin C improves the absorption of iron from non-meat sources, so ensuring a regular intake is useful if you are a vegetarian. Also, it has mild antihistamine properties, thus allergy sufferers may find it helpful. Furthermore, when we are under physical or mental stress, vitamin C is depleted from our adrenal glands; it plays a regulatory role in the production of the hormone cortisone that helps us cope with the pressures of life.