Niacinamide, an anti-acne pore-firming face serum, helps the skin produce more collagen and hyaluronic acid while shielding it from external factors. While niacinamide is a fantastic supplement on its own, when combined with zinc, it forms an extremely potent duo. Niacinamide serum is therefore perfect for balancing skin that is too greasy and prone to acne. The combined force of these two produces the pore-tightening effect.