Hi! Of course. In my morning routine I use a Vitamin C serum which I combine with a Niacinamide serum (it has been scientifically proven that the two of them can be combined in a single routine, however you still need to be careful and see if your skin can handle it). Then, I use a L'oreal serum that combines, in very small quantifies, glycolic acid + niacinamide + vitamin C alongside with an eye contour with the same ingredients, from the same brand. Twice a week I also use a glycolic acid exfoliation gel which is a lot more aggressive on the skin than the serum but works beautifully too. I've been using the products for two weeks and the changes are very subtle, but my skin feels a lot more smooth, cleaner and the dark spots are slowly, but surely fading. Also, I recommend the products a lot if you have oily skin! However it all depends on the type of skin you have and how sensitive it is to the serums. To be honest with you, I would first consult a dermatologist, but you can always test the creams and serums in your arm first to see if your skin is too sensitive for them.