How fast does niacin work?

Niacin, or vitamin B3, typically begins to take effect within 30 minutes to 2 hours after ingestion, depending on the formulation used (immediate-release vs. extended-release). Its effects can include increased blood flow and a flushing sensation. For cholesterol management, it may take several weeks to see significant changes in lipid levels. Always consult a healthcare professional before starting niacin supplementation.