The Ordinary Niacinamide 10% + Zinc 1% is a high-strength vitamin and mineral serum formulated to reduce skin blemishes and congestion. This water-based formula contains 10% pure niacinamide (vitamin B3) and 1% zinc PCA to help improve skin barrier function, control sebum production, and enhance overall skin clarity. This serum is suitable for all skin types but particularly beneficial for those with oily or blemish-prone skin. For best results, apply a few drops to face morning and evening before heavier creams. If using vitamin C products, apply at alternate times to maintain product integrity. While this formula helps improve the appearance of blemishes, it is not a treatment for acne. A patch test is recommended before first use. The product comes in a 60ml glass bottle with dropper applicator.