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Vitamins are substances necessary to sustain life, with many functions. Vitamins must be obtained from food, as they are either not made in the body at all or are not made in sufficient quantities for growth, vitality and wellbeing. Lack of a particular vitamin can lead to incomplete metabolism, fatigue and other important health problems. Deficiency of a vitamin causes symptoms which can be cured by that vitamin. Large doses of vitamins may slow or ever reverse diseases such as cancer, osteoporosis, nerve degeneration and heart disease.