K-SECRET Seoul 1988 Niacinamide 15% + Yuja Serum is a concentrated facial serum for routines centered on tone care. It brings the brand’s Seoul 1988 approach to a product applied after toner and before cream. The 30 ml format provides a dedicated brightening step that can be introduced gradually alongside familiar skincare.

Key Benefits

• Helps improve uneven-looking tone, supporting a more uniform appearance when darker patches interrupt the complexion’s natural finish.
• Revives the look of dull skin, encouraging a brighter, more luminous appearance with consistent use rather than occasional application.
• Provides moisturizing care that helps soften dry-feeling areas, keeping the skin comfortable while adding a targeted active product.

Key Features

• Formulated with 15% niacinamide, a clearly specified high concentration that gives this serum its principal skincare identity.
• Yuja, represented by citrus junos fruit oil, complements glutathione, tranexamic acid and a vitamin C derivative in the ingredient blend.
• Squalane, panthenol, beta-glucan and sodium hyaluronate are included alongside macadamia oil and shea butter for conditioning support.

Who It Is Suitable For

• Normal, dry and combination skin already accustomed to niacinamide, particularly for people seeking a more concentrated formula within an established routine.
• Adults who can assess active-product tolerance slowly; those with easily reactive skin may find a lower-strength niacinamide serum more comfortable.

How to Use

• After cleansing and toning, spread a small amount evenly over the face, avoiding direct contact with the eyes and lips.
• Allow it to absorb before applying moisturizer. Start with occasional applications and increase only if the skin remains comfortable with the concentration.
• Use morning or evening according to tolerance and apply sunscreen during the day. Reduce frequency or stop if persistent irritation develops.