You've probably been using niacinamide on your face for years, but your scalp is still itchy, flaky, and producing lackluster hair. In this episode, Dr. Elena Voss breaks down why the same vitamin B3 that transformed your skincare routine can revolutionize your scalp health—if you know what to look for in a formulation. She explains the science behind effective scalp penetration, reveals which supporting ingredients actually matter, and reviews six niacinamide serums that deliver clinical-grade results for under thirty dollars.

• Niacinamide concentration should fall between 3 and 10 percent for scalp applications—below 3 percent is marketing theater, while above 10 percent risks irritation without additional benefit since the dose-response curve plateaus around 8 percent.

• Scalp tissue produces 2 to 3 times more se ...