The Ordinary Niacinamide 10% + Zinc 1% is a water-based serum formulated to improve skin clarity and texture. This high-strength vitamin and mineral formula contains 10% pure niacinamide (vitamin B3) and 1% zinc PCA to help reduce the appearance of blemishes and congestion while supporting the skin barrier. This serum should be applied morning and evening before heavier creams. If using vitamin C products, they should be applied at alternate times to maintain efficacy. While this formula helps with skin appearance, it is not a treatment for acne. A patch test is recommended before first use. The product comes in a 30ml bottle with a dropper applicator for precise dispensing.