a form of niacin invented by the medical profession to avoid the flush which is turned on when a person takes niacin. What the medical profession didn't realize was that niacin itself doesn't turn on a flushNthe flush is caused by the fact that sunburn or radiation is being run out. Niacinamide is worthless for the purpose of running out radiation. —All About Radiation Glossary. Final approval 27.9.89