I have combination skin (mostly oily) with big pores on my nose chin and forehead. So far I am cleansing with a Nivea cleanser, toning with 6%glycolic 3 times a week and then moisturing with a basic Nivea moisturiser with SPF 15. I think I want to try adding vitamin c and niacinamide but I am not sure how to add them in. I am early 40s if that makes a difference and just starting to get fine lines. All advice welcomed.