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The Ordinary Niacinamide 10% + Zinc 1% is a water-based serum formulated to reduce skin blemishes and congestion. This high-strength vitamin and mineral formula contains 10% niacinamide (vitamin B3) and 1% zinc PCA to improve skin barrier function, smoothness, and radiance. This serum should be applied morning and evening before heavier creams. If using topical Vitamin C products, they should be applied at alternate times to maintain efficacy. While this formula helps with blemishes and skin tone, it is not an acne treatment. The product should be patch tested before first use and discontinued if irritation occurs. It contains key ingredients like niacinamide, zinc PCA, and other supporting ingredients in a water-based formula.