Your body doesn’t make it, it absorbs the vitamin from food – particularly meat, fish, eggs and dairy. Some people have conditions such as pernicious anaemia which stop them from getting as much as they need, other people, particularly those following a vegan diet, don’t get enough of the vitamin from their food.
Symptoms of deficiency can vary from person to person, but can include extreme tiredness and lack of energy, breathlessness and feeling faint, headaches, pale skin, heart palpitations and sometimes a loss of appetite and weight loss.
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