Repair & even skin tone while addressing acne. Niacinamide serum water is an active filler-free pure niacinamide suspension that supports repair and even skin tone while minimizing acne and regulating skin balance. This serum water will also address dark spots with continuous use and can be paired with TAHNYC's amino sugars serum water for enhanced efficacy and results. Their serum waters are active only waters formulated and focused on highly effective underrated powerful actives that are the key to healthy skin.