Yes, IF you need them.
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There are three general types of food-things your body needs to survive: Macronutrients, Vitamins, and minerals. Macronutrients are Carbohydrates, Protein, and Fat; and generally provide you the energy you need to do things. You also need protein to help build and repair cells, among other things. Vitamins are organic molecules (carbon-based molecules) that your body needs, but don’t provide energy. Minerals are the inorganic stuff (not-carbon-based; this includes things like sodium, potassium, phosphorus, iron, calcium, etc.) your body needs.
If you don’t get enough of certain vitamins, it causes health issues. Some well-known examples include scurvy (the fear of sailors and pirates; caused by not getting enough Vitamin C), and Pellagra (often the bane of poor farmers; caused by not getting enough Niacin, also called Vitamin B3). However, there’s a lot of other health problems if you’re missing vitamins – basically every vitamin was discovered by finding a group of people who was sick, fixing their diet, and then finding what about the fixed diet made a difference.
Vitamin supplements provide those vitamins. If you’re already getting enough, they won’t help – in some cases, too much of a vitamin can be harmful, even toxic: Vitamin C is connected with diarrhea and nausea; Vitamin B3 can cause to liver damage and diabetes. But if you’re short on them, they can be very helpful, even lifesaving.
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