You've probably read that Niacinamide and Vitamin C should never be used together — that they cancel each other out or cause flushing. This advice has been repeated so many times that it feels like established fact. It isn't.
Where the Myth Came From
Early research showed that combining Niacinamide with certain forms of Vitamin C could produce niacin, which can cause temporary facial flushing. However, this reaction requires high concentrations, significant heat, and extended contact time — conditions that don't exist on skin.
The Reality
Modern formulations that combine stabilized Vitamin C (L-ascorbic acid) with Niacinamide are not only safe — they're synergistic. Niacinamide reduces the potential for irritation that pure Vitamin C can cause, while Vitamin C boosts the brightening effects of Niacinamide.
HANU Glow Serum contains both ingredients in optimized concentrations specifically because of this synergy. The combined effect on hyperpigmentation and skin tone is measurably greater than either ingredient alone.