crowded tunnel during rush hour. One lane is barely moving, horns are blaring, and everything backs up. Niacin is the moment the tunnel expands and traffic finally breathes again.
That widening matters even more far from the heart, where blood has the hardest job reaching the smallest vessels in the feet and lower legs. When flow improves, the body stops acting like it is fighting uphill every time you walk to the kitchen.
And there is a second payoff people love: skin often looks less dull when circulation is less cramped. The face and legs are not separate stories; they are both reading from the same blood-flow script.
