K-SECRET Seoul 1988 Glow Serum — Niacinamide 15% + Yuja 30ml

Seoul's most-loved glow formula, now in your routine. The K-SECRET Seoul 1988 Glow Serum is a high-strength Korean brightening serum built around 15% Niacinamide and Citrus Junos (Yuja) Fruit Oil to help brighten dull skin and deliver an even-toned complexion— all in a lightweight, fast-absorbing texture that works morning and night without heaviness or grease. A potent brightening complex of Glutathione and Tranexamic Acid targets pigmentation and fades the appearance of old blemishes and redness for a clearer, more uniform complexion. 

Inspired by Seoul, perfected by derma — K-SECRET blends traditional Korean beauty wisdom with modern skincare science  to deliver a serum that tackles dullness, dark spots, uneven texture, and dehydration simultaneously, with just a few drops.

Why it works:

• 15% Niacinamide (Vitamin B3) — strengthens, smooths, and brightens skin while regulating oil production, minimising pores, and improving visible signs of ageing — at 15% this is a clinical-strength concentration that delivers results faster than standard 5–10% formulas
• Yuja (Citrus Junos) Fruit Oil — packed with antioxidants and Vitamin C for a radiant glow and protection against environmental stressors  — Yuja is Korea's answer to lemon, beloved for its exceptional brightening and skin-conditioning properties
• Glutathione — an antioxidant that helps fight free radicals and supports skin brightening , targeting stubborn pigmentation and post-breakout marks from within
• Tranexamic Acid — fades dark spots, sun damage, and hyperpigmentation at a deeper level by interrupting melanin transfer in the skin
• Sodium Ascorbyl Phosphate (Vitamin C) — a stable, non-irritating form of Vitamin C that amplifies the brightening effect of the Niacinamide and Yuja complex
• Squalane & Shea Butter — plump the skin and provide lasting moisture for a smoother, more supple feel  without clogging pores or leaving a greasy finish
• Panthenol (Vitamin B5) — deeply hydrates and soothes sensitive or dehydrated skin , reinforcing the skin barrier as the actives work
• Sodium Hyaluronate & Beta-Glucan — dual-action hydration that draws moisture in and locks it in for a visibly plumper, dewier complexion
• Adenosine — clinically proven to soften fine lines and support skin firmness over time
• Turmeric Root Extract & Tranexamic Acid — additional skin brightening actives that work synergistically with Niacinamide for a comprehensive multi-pathway brightening approach 
• Free from harsh alcohols, parabens, silicones, and sulfates  — suitable for all skin types including sensitive

How to use: After cleansing and toning, take 3–5 drops of the serum and spread evenly over the entire face.  Gently pat with fingertips until fully absorbed. Follow with moisturiser. Suitable for morning and evening use. Always apply SPF in the morning when using brightening actives.

Suitable for: All skin types · Especially dull, dry skin, pigmentation, uneven texture, and troubled skin · Sensitive skin · Fragrance-free · Made in Korea 🇰🇷

Why Seoulma recommends it:

The brightening serum category is one of the most crowded in K-Beauty — and it's also one where quality varies enormously. Most brightening serums either use low concentrations that take forever to work, or they go heavy on actives without supporting ingredients to keep the skin barrier healthy. The K-SECRET Seoul 1988 Glow Serum gets the balance exactly right.

The 15% Niacinamide concentration is the headline, and it earns that spotlight. At this level you're genuinely in clinical territory — this is the kind of concentration that delivers visible changes in skin tone, pore size, and texture within weeks, not months. But what makes this serum smarter than just a high-dose Niacinamide formula is the supporting cast around it. Glutathione, Tranexamic Acid, and Sodium Ascorbyl Phosphate all work on pigmentation through completely different pathways — so rather than hammering one mechanism, the formula is attacking dark spots and uneven tone from three directions at once.

The Yuja oil is also genuinely special. Yuja — the Korean citron — has been used in Korean wellness for generations, and its Vitamin C content and antioxidant profile are exceptional. It gives this serum a warmth and glow that pure Niacinamide formulas lack, and keeps the overall feel more like a luxury treatment than a clinical active.

We recommend it as the go-to brightening step for anyone dealing with post-acne marks, sun spots, or that grey, dull tone that builds up from stress and pollution. Pair it with SPF every morning and a ceramide-rich moisturiser, and you'll see a difference in your skin tone within three to four weeks.