Niacinamide and vitamin C are both brightening heroes, but they work in different ways.
Niacinamide
Vitamin B3 strengthens the skin barrier, refines the look of pores and calms redness. It suits almost every skin type, including sensitive skin.
Vitamin C
An antioxidant that helps defend against daily pollution and fades dark spots over time. It is best used in the morning under SPF.
Can you use both?
Yes. Apply vitamin C in the morning and niacinamide in the evening, or layer them with a minute in between.