Vitamin B3 is naturally found in foods such as poultry, fish (like tuna and salmon), peanuts, brown rice, legumes, and whole grains. For many people, a balanced diet provides enough niacin to support basic needs.
In some cases, supplements may be recommended—but only under medical guidance. High doses of niacin can cause side effects including flushing, digestive discomfort, dizziness, and, in rare situations, liver complications. A healthcare provider can help determine whether supplementation is appropriate and what dosage is safe.
The Bottom Line
If you regularly experience cold feet, leg fatigue, or numbness, addressing circulation should be a priority. Vitamin B3 is one of the most effective nutrients for supporting healthy blood flow, but it works best when combined with regular movement, proper hydration, a nutrient-rich diet, and professional medical advice.
