- Supplements of niacin may cause flushing or redness of your skin, especially your face and neck, although taking extended-release supplements may reduce this effect.
- Niacin supplements may cause you to feel dizzy or lightheaded shortly after swallowing them; taking the supplement on a full stomach may prevent this symptom.
- You may experience itching all over your body soon after taking a niacin supplement, and taking niacin for a long period of time may result in dryness and flaking of your skin.
- Digestive problems, including gas, bloating, loss of appetite, nausea, vomiting and diarrhea, are side effects of taking niacin.
- Niacin may cause you to have cramps in your large muscles, such as those in your back, legs and upper arms.
- If you take niacin too close to your bedtime, you may experience difficulty falling asleep or staying asleep (insomnia).
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