Replying to @prettyrosey3 #niacinamide and #vitaminc works well together , they do not cancel each other out. Here is how you are going to use niacinamde and vitamin c . I would apply the niacinamde first. Let it absorb into my skin, then the vitamin C , then sunscreen. Both are great ingredients for brightening the skin & helping with #hyperpigmentation #drnatashahenry #hyperpigmentationtreatment #niacinamideserum #vitamincserum #howtousevitaminc #howtouseniacinamide #glowingskintips #glowingskintips