One side effect of taking niacin supplements is mild flushing. Ross described it as a feeling of warmth, itching, redness or a tingly feeling under the skin. The flushing is harmless and usually subsides within one or two hours, according to the British Columbia Drug and Poison Information Center (DPIC). Some over-the-counter niacin tablets deliver the dose in a short burst, which makes the reaction more intense. Timed-release tablets deliver the vitamin more slowly, which reduces the intensity of the flushing. However, this type of niacin may cause liver damage in some people, according to the DPIC.
Attention deficit hyperactivity disorder, better known as ADHD, is a controversial diagnosis marked by distractibility, hyperactivity, and impulsivity. Adults are more likely to be diagnosed with attention deficit disorder, or ADD, which lacks this hyperactivity characteristic, but is similar in other ways to ADHD. More than one in 10 children in the . will be diagnosed with ADD/ADHD, a figure that has grown exponentially in the last 50 years. Since 1957, doctors have been treating ADD/ADHD patients with psychostimulants like Adderall, Ritalin, and Concerta.