numbuzin No.5 Vitamin Concentrated Serum — Brightening Dark Spot Serum 1.01 fl oz, Tranexamic Acid 4% & Niacinamide 5%

numbuzin No.5 Vitamin Concentrated Serum is a lightweight, multi-ingredient daily serum formulated to help even skin tone and support a radiant-looking complexion.

This Seoul-inspired formula blends targeted brightening actives and supportive hydrators in a single bottle to simplify your routine. Key actives include Tranexamic Acid 4% and Niacinamide 5% alongside glutathione, vitamin C, panthenol, and ceramides. The alcohol- and oil-free texture absorbs quickly, making it a practical morning or evening step under moisturizers and sunscreens without feeling heavy.

How does this serum address uneven tone and dark spots?

The serum combines tranexamic acid and niacinamide to help target areas of discoloration while glutathione and vitamin C provide antioxidant support. These ingredients work together to promote a brighter, more even-looking surface when used consistently as part of a daily regimen.

• Tranexamic Acid 4%: targeted tone-correcting active for discoloration-prone areas.
• Niacinamide 5%: helps refine skin texture and supports more even tone.
• Glutathione + Vitamin C: antioxidant duo to help enhance radiance.

Will the serum layer well with my other skincare products?

Yes — the serum is formulated to fit smoothly into multi-step routines. Its fluid, fast-absorbing feel lets it sit comfortably beneath creams, oils, and sunscreen without pilling, and the alcohol-free, oil-free base minimizes interactions with other products.

• Lightweight texture: absorbs quickly for seamless layering.
• Compatible with moisturizers and SPF: use before heavier products.
• Works both AM and PM: apply after cleansing and toning.

Is this suitable for sensitive or combination skin?

The formula avoids alcohol and heavy oils, which helps reduce irritation and residue for many skin types. It also contains panthenol and ceramides to support the skin barrier, but as with any active serum, patch testing is recommended for those with very reactive skin.

• Alcohol-free and oil-free base for a breathable finish.
• Panthenol and ceramides help nurture barrier resilience.
• Designed for dry, oily, combination, and many sensitive skin types.

How should I use numbuzin No.5 in my daily routine?

Apply a few drops to clean, dry skin after toner and before moisturizer. Use it once or twice daily depending on your routine; in the morning pair it with broad-spectrum SPF to protect results, and at night follow with your preferred treatment or cream.

• Step 1: Cleanse and tone your face.
• Step 2: Apply 2–4 drops, patting gently over face or on target areas.
• Step 3: Follow with moisturizer and SPF in the morning.

Who is this for: numbuzin No.5 is aimed at people looking for a convenient, multi-purpose serum to help improve the appearance of uneven tone and boost radiance without heavy oils or alcohol. It suits those who prefer streamlined routines that still include proven brightening and barrier-support ingredients. If you have very reactive skin or are using prescription actives, consult a dermatologist and patch-test before full use. Packaged in a 1.01 fl oz bottle, it’s compact enough for everyday use and travel-friendly routines.

Ingredients

Water, Butylene Glycol, Niacinamide, Panthenol, Tranexamic Acid, 1,2-Hexanediol, Neopentyl Glycol Dicaprate, Caprylic/Capric Triglyceride, Sorbitol, Vaccinium Vitis-Idaea Fruit Extract, Chondrus Crispus Extract, Butyrospermum Parkii (Shea) Butter, Saccharum Officinarum (Sugarcane) Extract, Alpha-Arbutin, Bifida Ferment Lysate, Sodium Hyaluronate, Melia Azadirachta Flower Extract, Ocimum Sanctum Leaf Extract, Melia Azadirachta Leaf Extract, Curcuma Longa (Turmeric) Root Extract, Corallina Officinalis Extract, Tremella Fuciformis (Mushroom) Extract, Pentylene Glycol, Glycerin, 3-0-Ethyl Ascorbic Acid, Bisabolol, Tromethamine, Ethylhexylglycerin, Adenosine, Hydrogenated Lecithin, Allantoin, Glutathione, Ceramide Np, Beta-Glucan, Dipotassium Glycyrrhizate, Tocopherol, Ascorbic Acid, Ascorbyl Glucoside, Tocopheryl Acetate, Hydroxypropyl Cyclodextrin, Ubiquinone, Thioctic Acid, Potassium Hydroxide, Behenyl Alcohol, Carbomer, Xanthan Gum, Disodium EDTA.