The Niacinamide 15 Serum with Acetyl Glucosamine + Zinc PCA - BenefitsZinc PCA : Inhibits inflammation and promotes recovery of damaged skinAllantoin : Promotes collagen synthesis to facilitate skin regenerationNiacinamide : Provides total acne care by controlling sebum production, soothing acne inflammation and diminishing post acne scarsN-Acetylglucosamine (NAG) : Works in synergy with niacinamide to effectively fade hyperpigmentation - The Niacinamide 15 Serum with Acetyl Glucosamine + Zinc PCA