Crystalline niacin, also known as niacin, is a form of vitamin B3. Vitamin B3 is found in meat, fish, milk, eggs and green vegetables, but it can also be found in vitamin B complex supplements. Crystalline niacin is used to treat high cholesterol, circulatory problems, migraines, dizziness and diarrhea. According to MayoClinic.com, the Food and Nutrition Board recommends 14 to 18mg of niacin daily for adults. There is not enough scientific evidence to recommend the safe use of niacin in children. Side effects can occur, so seek medical advice before taking supplements.
Flushing
The most common side effect associated with the initial use of crystalline niacin is flushing. Crystalline niacin can dilate blood vessels in the skin and cause flushing. According to MayoClinic.com, people who take more than 1,000mg of niacin on a daily basis may experience temporary burning, tingling, itching and redness of the face, arms and chest. Dilated blood vessels may also trigger headaches in some people. Large amounts of alcohol can worsen the side effect of flushing, so it is important not to consume alcohol with crystalline niacin. This side effect usually diminishes as the body gets used to the supplement.
Gastrointestinal Problems and Liver Toxicity
Serious side effects associated with crystalline niacin usage are gastrointestinal problems and liver toxicity. According to Medline Plus, people who take more than 3g of crystalline niacin daily may experience gastrointestinal problems, such as an upset stomach, mild to moderate diarrhea, bloating, nausea, intestinal gas, digestive tract ulcers and vomiting. In addition, people who take crystalline niacin are at risk for liver toxicity, such as increased liver enzyme levels, jaundice or yellowing of the skin and eyes, fluid accumulation in the abdomen or liver failure.
Itchy Skin
Some people may experience itchy, dry skin after taking crystalline niacin, according to MayoClinic.com. The itchy skin may be accompanied by a rash and patches of rough and scaly skin. The itchy skin is usually harmless and should subside with continued use.
Heart Problems and Low Blood Pressure
People who take crystalline niacin may be at risk for heart problems and low blood pressure, according to Medline Plus. Large amounts of niacin can cause irregular heartbeats, heart palpitations, heart disease and circulatory collapse in some people, so seek medical advice before talking this supplement. In addition, people who have low blood pressure should avoid taking crystalline niacin because it can cause an even further decline in blood pressure.
Increased Blood Sugar
A serious side effect associated with crystalline niacin is increased blood sugar, according to MayoClinic.com. Crystalline niacin can increase the amount of blood sugar in the body so diabetics should avoid niacin unless it is recommended by a medical professional.
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