Description
The Numbuzin No.5+ Glutathione Vitamin Concentrated Serum is an intensive daily brightening serum from Numbuzin's No.5 "Hyperpigmentation & Radiance" series, designed to effectively address spots, uneven tone and dullness through a powerful antioxidant network of multiple brightening actives.
The formula is based on 60.4% Vaccinium Vitis-Idaea (Lingonberry) Extract — an extremely rich source of antioxidants — and four central brightening active ingredients with proven concentration: 5% Niacinamide (50,000 ppm), 4% Tranexamic Acid (40,000 ppm), Glutathione (100 ppm) and 3-O-Ethyl Ascorbic Acid (Vitamin C — 2,000 ppm), enhanced by a comprehensive 6-molecule antioxidant complex (Glutathione, Vitamin C, Ubiquinone/CoQ10, Thioctic Acid/ALA, Tocopherol/Vit E, Tocopheryl Acetate).
Clinically proven: +18.90% skin tone homogeneity and -9.65% spot reduction in 4 weeks. Tested with Irritation Index 0.00 — suitable for sensitive skin. Light, watery texture, alcohol-free, fragrance-free, paraben-free, silicone-free.
TARGETS
• Hyperpigmentation and dark spots
• Post-inflammatory hyperpigmentation (PIH) and acne marks
• Uneven skin tone and sunspots
• Dullness, fatigue and lack of radiance
• Oxidative stress and free radical damage
• Weakened skin barrier
• Uneven texture and surface roughness
SUITABLE FOR
• All skin types (Irritation Index 0.00)
• Sensitive skin that wants brightening without irritation
• Oily and combination skin with acne tendency and post-acne blemishes
• Skin with hyperpigmentation from sun exposure, pregnancy, or inflammation
• Users seeking an alternative to strong acids (AHA/retinol) — a milder formula
• Individuals with dull, tired skin that needs an energy boost
• Daily use morning and/or evening — always with SPF in the morning
BENEFITS
• +18.90% skin tone evenness in 4 weeks — clinically proven
• -9.65% reduction in blemishes in 4 weeks — clinically proven
• Inhibition of melanin production through multiple pathways (Tranexamic Acid + Niacinamide + Alpha-Arbutin + Glutathione + Vitamin C)
• Tone equalization and brightening — thanks to the synergistic brightening network of 6+ ingredients
• Neutralization of oxidative stress with Antioxidant Network (Glutathione, CoQ10, ALA, Vit C, Vit E) — protection against free radicals
• Skin barrier enhancement with Ceramide NP, Bifida Ferment Lysate, Beta-Glucan, and Panthenol
• Intensive hydration with Sodium Hyaluronate, Panthenol, Beta-Glucan, Tremella Extract
• Soothing irritation with Bisabolol, Allantoin, Dipotassium Glycyrrhizate, Panthenol (5%)
• Skin renewal with Adenosine (anti-aging) and Bifida Ferment Lysate (microbiome balance)
• Light, watery texture — absorbs quickly without greasiness, suitable for layering
• Irritation Index 0.00 — tested for zero irritation, safe for sensitive skin
KEY INGREDIENTS
• Vaccinium Vitis-Idaea Fruit Extract (60.4% / 604,074 ppm — Lingonberry): The base of the entire formula — Lingonberry (Vaccinium) berry extract in an exceptionally high concentration of 60.4%. Amazingly rich in anthocyanins, vitamin C, vitamin E, polyphenols, and quercetin. Powerful antioxidant, anti-inflammatory, and brightening. Enhances skin's resistance to UV-induced oxidation and hyperpigmentation
• Niacinamide (5% / 50,000 ppm): The "central controller" of hyperpigmentation — inhibits the transfer of melanosomes from melanocytes to keratinocytes, reducing visible spots and uneven tone. Simultaneously strengthens the skin barrier, regulates sebum, minimizes pores, and has anti-inflammatory action
• Tranexamic Acid (4% / 40,000 ppm): One of the most effective brightening actives in modern K-beauty. Inhibits the UV-induced plasminogen/plasmin pathway that activates melanocytes. Targets hyperpigmented spots, melasma, PIH, and sun spots. A mild ingredient that also works on sensitive skin
• Glutathione (100 ppm): The main endogenous antioxidant tripeptide of the cell (glycine + cysteine + glutamic acid). Inhibits tyrosinase (the main enzyme for melanin production), shifts eumelanin (dark) synthesis towards pheomelanin (light-colored), and protects against UV-induced oxidation. A central brightening + antioxidant dual-action molecule
• 3-O-Ethyl Ascorbic Acid (Vitamin C — 2,000 ppm): Stable Vitamin C derivative with an excellent skin penetration profile. Acts as a tyrosinase inhibitor, stimulates collagen, brightens, and protects against UV-induced pigmentation. Clinically proven brightening action at 2%
• 6-Molecule Antioxidant Network: Glutathione + L-Ascorbic Acid + Ascorbyl Glucoside + Tocopherol (Vitamin E) + Tocopheryl Acetate + Ubiquinone (CoQ10) + Thioctic Acid (Alpha Lipoic Acid). This combination creates an "Antioxidant Network" where the molecules mutually regenerate each other — especially Vitamin C regenerates Vitamin E, and ALA regenerates both
• Alpha-Arbutin: Tyrosinase inhibitor — prevents the production of new melanin. More potent than β-Arbutin, selective, and with a mild irritation profile
• Bifida Ferment Lysate (Probiotic): Bifidobacterium fermentation extract — balances the skin microbiome, strengthens the skin barrier, reduces sensitivity to external factors, and supports cell renewal
• Panthenol (5% / 50,000 ppm): Provitamin B5 in a high concentration of 5% — soothes, moisturizes, enhances skin regeneration. Counteracts any irritation from the brightening actives
• Beta-Glucan: Polysaccharide with moisturizing properties equivalent to Hyaluronic Acid. Strengthens barrier, accelerates healing, soothes
• Ceramide NP: Strengthens the lipid barrier, prevents TEWL, restores barrier integrity
• Bisabolol: Chamomile extract — anti-inflammatory, soothing, enhances the penetration of other active ingredients
If you are looking for a Korean Beauty serum that comprehensively addresses hyperpigmentation through an amazingly rich antioxidant + brightening network, with clinically proven results and zero irritation, the Numbuzin No.5+ Glutathione Vitamin Concentrated Serum is the most complete and gentle option for daily brightening.
How to Use
Ingredients
