This is such a fantastic product. If you’re currently at 5%, I can’t see much irritation by integrating The Ordinary’s niacinamide serum into your skincare routine. Niacinamide in general is fantastic for your skin. It minimizes enlarged pores and improves the texture of skin, restores your skin’s defences against dehydration and the loss of moisture, and even outs skin tone and sun damage discoloration. The ingredient is frequently used in conjunction with AHAs, BHAs, sodium hyaluronate, glycerin, peptides, and all sorts of antioxidants. you will see synergistic results if you layer your niacinamide among your cleanser, toner, exfoliants, serums/treatments/moisturizers, and any other skin care products you may be using. Moreover, this line is known to be cruelty free, does not contain animal products, and is endorsed by PETA. Best of luck to you!