Niacin, also known as vitamin B3, is an important nutrient. In fact, every part of your body needs it to function properly.
It plays an important role in maintaining the health of your heart, blood vessels, and metabolism. It may also be used with other medications to decrease bad cholesterol and fats (such as LDL, triglycerides) and increase good cholesterol (HDL) in your blood.
These are some of the symptoms of niacin deficiency:
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skin rash or discoloration
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bright red tongue
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vomiting
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constipation or diarrhea
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depression
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fatigue
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headache
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memory loss
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loss of appetite