NUMBUZIN No.4 Ceramide AHA Glazed Skin Prep Serum is a Korean dual-action skin prep serum. It contains 3% glycolic acid (AHA) and 3% gluconolactone (PHA) for gentle exfoliation, smoothing texture, reducing flakiness, and brightening dull skin. Infused with 5 types of ceramides, panthenol, and niacinamide, it repairs and strengthens the skin barrier, deeply hydrates, and soothes irritation. The milky, fast-absorbing formula is alcohol-free, fragrance-free, and suitable for all skin types, especially dry, flaky, and sensitive skin. It preps skin for better absorption of subsequent products and creates a smooth, glazed, radiant complexion.

Water, Glycerin, Glycolic Acid, Butylene Glycol, Gluconolactone, Betaine, Dipropylene Glycol, Niacinamide, Panthenol, Pentylene Glycol, Sodium Hydroxide, Sphingomonas Ferment Extract, Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate Crosspolymer, Ceramide NP, Ceramide NS, Ceramide AP, Ceramide AS, Ceramide EOP, Phytosphingosine, Cholesterol, Urea, Beta-Glucan, Adenosine, Tocopherol, 1,2-Hexanediol, Caprylyl Glycol, Ethylhexylglycerin, Carbomer, Xanthan Gum, Disodium EDTA.

After cleansing, apply 1–2 full droppers of the serum as the first skincare step.
Gently pat the serum onto the face and neck until fully absorbed.
Follow with toner, essence, moisturizer, and sunscreen (daytime).
Use daily, morning and evening; patch test before first use.