The droppers have some product that has clumped due to some product mishandling or from the weather. Item has expiration date of 05/2025. The Niacinamide 15 Serum with Acetyl Glucosamine + Zinc PCA from COSRX is a highly concentrated serum that combines the maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control. Niacinamide : Provides total acne care by controlling sebum production, soothing acne inflammation and diminishing post acne scars N-Acetylglucosamine (NAG) : Works in synergy with niacinamide to effectively fade hyperpigmentation Zinc PCA : Inhibits inflammation and promotes recovery of damaged skin Allantoin : Promotes collagen synthesis to facilitate skin regeneration