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The Effects of Niacin Overdose

author image Jan Millehan
Jan Millehan has published articles relating to health, fitness and disease on various websites. Her publishing history includes health-related articles on blogs and online directories, as well as an essay published in the Bridgewater College journal, "Philomathean." Millehan received a Bachelor of Science in elementary education from Bridgewater College.

Niacin is a type of B vitamin used to help the digestive system, liver, and skin (Reference 2). It is important to incorporate as part of a healthy diet, however it is not without side effects (Reference 3). Most of the side effects experienced with niacin overdose affect the gastrointestinal system and skin (References 1 and 2).

The downside

Normal doses of niacin can induce side effects such as facial flushing and itchiness, however, these usually subside after repeated use of niacin (Reference 2). Other dermatologic side effects may include hyperpigmentation and skin rash (Reference 1). Common gastrointestinal side effects include nausea, vomiting, and diarrhea (Reference 1). Continued use of niacin at high doses has been linked to increased possibility of liver disease. (Reference 3). Consult your physician if you experience repeated and prolonged side effects.

Prescription Niacin Overdose

Very high doses of niacin are available by prescription to prevent or improve a variety of conditions such as heart disease and diabetes (Reference 3). However, niacin can be toxic at high doses and

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