The internet says no. Science says yes.
The definitive answer, backed by the actual research.
YES. Use them together.
The myth comes from a 1960s study where ascorbic acid and niacinamide reacted when heated together in a test tube. Your face is not a test tube. Modern formulations are stable. Multiple 2020s studies confirm: combining them enhances brightening results.
If you want to be extra cautious: vitamin C serum in the morning, niacinamide at night. But using them in the same routine is completely fine.
Best vitamin C + niacinamide products
By Wishtrend
Vitamin C 23 Serum
$2823% pure vitamin C fades marks visibly in 4-6 weeks
Beauty of Joseon
Glow Serum: Propolis + Niacinamide
$17Propolis heals + niacinamide brightens — visible glow in 2 weeks