A vitamin is one of a group of organic substances that is present in minute amounts in natural foodstuffs. Vitamins are essential to normal metabolism. If we do not take enough of any kind of vitamin, certain medical conditions can result. It is not true today that a 'good diet' could give all the nutrients needed: Everyone's idea of a good diet is different and people's health conditions even more so.
In addition agricultural and farming methods are not the same as they were with an increased reliance on chemicals to compensate for what has been lost. From Veganism to Fruitarianism all diets can benefit from extra supplementation and as we pass through the different stages of life, from childhood to old age, our nutrient needs will change. This is even more true today than ever in the past.
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