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There are 13 vitamins. They strengthen the immune system and
are indispensable for building cells, blood cells, teeth and bones. Our food
contains mostly all important substances, but there are exceptions.Vitamin D ,
for example, has the peculiarity that there are hardly any foods in which it is
contained. Instead, the body uses sunlight to make it.However, if the days are
shorter in winter, too little UV radiation reaches our skin.
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