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Vitamins 'can increase risk of heart disease'. Scientists are warning against the use of certain vitamins amid claims they can increase the risk of heart disease. Britons are being told not to take supplements containing vitamin A or beta carotene. Research has found those vitamins lead to 'small but significant' increases in the chances of developing cardiovascular disease and of death from all causes. Both are found in many multivitamin capsules or can be taken on their own.
For example, a number of the B vitamins are important for making red blood cells, and metabolism of a variety of compounds during digestion. Others have uses in more specific parts of the body; for example, vitamin A is important for our eyesight, whilst vitamin K plays a major role in the clotting of blood. Similarly, deficiencies of vitamins can also have effects; a lack of vitamin C can lead to scurvy, the bane of sailors before the role of vitamin C was understood. A lack of vitamin K can cause bleeding problems, which is why newborn babies are given a shot containing the vitamin, preventing bleeding on the brain and the subsequent potential brain damage.