What skin concerns does Niacinamide 10% + Zinc 1% Serum address? The Niacinamide 10% + Zinc 1% Serum addresses enlarged pores, helps regulate excess sebum, targets wrinkles and fine lines, improves plumpness and suppleness, and supports overall skin radiance. Can I use Niacinamide 10% + Zinc 1% Serum with vitamin C products? We recommend using niacinamide and vitamin C in separate routines. Combining these active ingredients may decrease effectiveness. How often should I apply Niacinamide 10% + Zinc 1% Serum? We recommend using the Niacinamide 10% + Zinc 1% Serum twice daily in your AM and PM routines—after cleansing, and before applying heavier moisturizers or treatments. Is Niacinamide 10% + Zinc 1% Serum suitable for blemish-prone skin? Yes, The Ordinary Niacinimide 10% + Zinc 1% Serum is suitable for blemish-prone skin. It is non-comedogenic*, helps balance sebum production, and addresses signs of congestion. *In a clinical study of 35 subjects applying product 2x/day for 8 weeks How long does it take to see results with Niacinamide 10% + Zinc 1% Serum? After 15 minutes, expect improvement in plumpness, suppleness, and skin radiance. In 1 week, you should notice smoother skin texture. With continued use, expect a decrease in pore visibility, sebum overproduction, and visible signs of aging. Niacinamide 10% + Zinc 1% Retinal 0.2% Emulsion Retinol 1% in Squalane Retinol 0.5% in Squalane Granactive Retinoid