numbuzin No.5 Vitamin Concentrated Serum — Tranexamic Acid 4% + Niacinamide 5% for Brightening, Lightweight 1.01 fl oz

This Korean-style formula brings several brightening and skin-supporting actives into one bottle for straightforward morning and evening use. The fast-absorbing liquid layers easily under moisturizers and sunscreens and avoids alcohol and oils for a breathable sensation on the skin. The ingredient mix is aimed at tackling uneven tone and adding antioxidant support while keeping application simple.

How does this serum address dark spots and uneven tone?

The blend targets pigmentation-prone areas using tranexamic acid (TXA) at 4% and niacinamide at 5%, two widely used actives for skin tone improvement. Glutathione and vitamin C provide antioxidant support that complements those primary ingredients without heavy textures.

• Tranexamic Acid 4% to target discoloration-prone areas.
• Niacinamide 5% to help brighten and refine skin tone.
• Glutathione and Vitamin C add antioxidant support for a clearer-looking finish.

Will this serum feel heavy or sticky under makeup?

No — the serum is formulated as a fluid, fast-absorbing texture that sits comfortably beneath other products. Because it is oil-free and alcohol-free, it creates a smooth base that works well under sunscreen or foundation without pilling.

• Light, fluid texture designed for quick absorption.
• Oil-free and alcohol-free for a breathable finish.
• Compatible with layers such as moisturizer, sunscreen, and makeup.

How should I include it in my skincare routine safely?

Apply a few drops to clean skin in the morning and/or evening depending on tolerance and follow with moisturizer and sunscreen for daytime use. Patch-test before first use if you have sensitive skin, and introduce gradually alongside other actives to reduce irritation risk.

• Use 2–4 drops on cleansed face; pat gently until absorbed.
• For daytime, finish with broad-spectrum sunscreen.
• Start with every-other-day use if combining with strong actives.

What other skin benefits are included beyond brightening?

The serum includes panthenol and ceramides to help maintain skin comfort and barrier resilience, plus humectant-like behavior that keeps skin feeling supple. These supportive ingredients make the formula more than just a brightener — they help preserve a comfortable skin feel while layering actives.

• Panthenol for soothing and hydration support.
• Ceramides to support barrier integrity and reduce moisture loss.
• Balanced formula that aims to be suitable for sensitive and combination skin types.

Who this is for: numbuzin No.5 is designed for anyone looking to address post-acne marks, sun-induced dark spots, or general unevenness without heavy or oily textures. It suits dry, oily, combination, and many sensitive skin types when introduced carefully; those seeking aggressive clinical treatments should consult a professional. Use as part of a routine that includes sunscreen in daytime to protect results and help maintain an even-looking complexion.

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.