numbuzin No.5 Glutathione Vitamin Concentrated Serum
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Our Verdict
Solid brightening serum with potent actives, but glutathione at just 100ppm and low Vitamin C deliver underwhelming punch for the price. Efficacy score of 4.5 reflects strong 5% niacinamide and 4% tranexamic acid for melanin inhibition, plus synergistic Vitamin C (0.2%) and arbutin, but deducts for trace glutathione (100ppm ineffective standalone) and unspecified pH potentially suboptimal for ascorbate stability; no encapsulation noted, though water-based dropper packaging preserves antioxidants well.
Key Ingredients Found
Full Ingredients List
Vaccinium Vitis-Idaea Fruit Extract (604,074 ppm), Butylene Glycol, Niacinamide (50,000 ppm), Panthenol (50,000 ppm), Tranexamic Acid (40,000 ppm), Aqua, 1,2-Hexanediol, Neopentyl Glycol Dicaprate, Capric/Caprylic Triglycerides, Sorbitol, Bifida Ferment Filtrate, Chondrus Crispus Extract, Butyrospermum Parkii Butter, Saccharum Officinarum Extract, Alpha-Arbutin, Sodium Hyaluronate, Melia Azadirachta Flower Extract, Ocimum Sanctum Leaf Extract, Melia Azadirachta Leaf Extract, Curcuma Longa Root Extract, Corallina Officinalis Extract, Tremella Fuciformis Extract, Pentylene Glycol, Glycerin, 3-O-Ethyl Ascorbic Acid (2,000 ppm), Alpha Bisabolol, Tromethamine, Ethylhexylglycerin, Adenosine, Hydrogenated Lecithin, Allantoin, Glutathione (100 ppm), Ceramide NP, Beta-Glucan, Dipotassium Glycyrrhizate, Tocopherol, L Ascorbic Acid, Ascorbyl Glucoside, Tocopheryl Acetate, Hydroxypropyl Cyclodextrin, Ubiquinone, Alpha Lipoic Acid, Potassium Hydroxide, Behenyl Alcohol, Carbomer, Xanthan Gum, Disodium EDTA
How To Use
Step 4 (Serum): Apply 2–3 drops to cleansed skin morning and/or evening. Pat gently until fully absorbed before moisturiser. For best brightening results, use consistently for 8–12 weeks. Always follow with SPF in the morning when using Vitamin C and tranexamic acid.
Suited To
All skin types with hyperpigmentation, dark spots, post-acne marks, or uneven skin tone. Fragrance-free and free of known irritants — suitable for sensitive skin. A strong choice for those wanting a multi-active brightening serum without the instability issues of pure ascorbic acid.
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