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Most people do not need to take vitamin supplements and can get all the vitamins and minerals they need by eating a healthy, balanced diet.
Many people choose to take supplements but taking too much or taking them for too long could be harmful. The Department of Health and Social Care recommends certain supplements for some groups of people who are at risk of deficiency like in pregnancy or who have vitamin D deficiency.
If you think that you already taking your daily requirements from food then better not to take extra vitamins
The heme iron found in meat and animal products is generally more easily absorbed by the human body than the non-heme iron found in plants. However, Dried beans and dark green leafy vegetables are also very good sources of iron, even better on a per calorie basis than meat. Iron absorption is increased markedly by eating foods containing vitamin C along with foods containing iron. Vegetarians do not have a higher incidence of iron deficiency than do meat eaters.