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[ DemythSkin Verdict ]

numbuzin No.5+ Glutathione Vitamin Concentrated Serum
SerumBrightening
Efficacy
Exceptional
4.5 / 5.0
Safety
Safe
4.4 / 5.0
System Verdict
This is an aggressively brightening, antioxidant-dense serum with unusually high pigment-fading actives, but its glutathione and vitamin C story is more marketing than meaningful driver of results. The efficacy score is high because niacinamide (~5%), tranexamic acid (~4%), alpha-arbutin and multiple hydration/soothing agents sit high in the INCI at quantified ppm levels, giving real support for hyperpigmentation and barrier-friendly use, while the antioxidant network (glutathione, several forms of vitamin C, vitamin E, CoQ10, alpha lipoic acid) is present but mostly in lower-list positions and at modest concentrations, so they support but do not reach gold-standard potency for melasma or severe PIH.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Tranexamic AcidAscorbic Acid
A Tier: Good BasicsProven Results
WaterNiacinamidePanthenolCaprylic/Capric TriglycerideSorbitolGlycerinButyrospermum Parkii (Shea) Butter3-O-Ethyl Ascorbic AcidAlpha-ArbutinBisabololBifida Ferment LysateAdenosineHydrogenated LecithinAllantoinSodium HyaluronateCeramide NPBeta-GlucanTocopherolAscorbyl GlucosideTocopheryl AcetateUbiquinone
B Tier: Supporting IngredientsPromising Ingredients
Butylene Glycol1,2-HexanediolNeopentyl Glycol DicaprateBehenyl AlcoholPentylene GlycolCarbomerTromethamineXanthan GumDisodium EDTADipotassium GlycyrrhizateHydroxypropyl CyclodextrinThioctic AcidPotassium Hydroxide
C Tier: Marketing IdolsHype | Limited or Weak Data
Vaccinium Vitis-Idaea Fruit ExtractChondrus Crispus ExtractSaccharum Officinarum (Sugarcane) ExtractGlutathioneMelia Azadirachta Flower ExtractOcimum Sanctum Leaf ExtractMelia Azadirachta Leaf ExtractCurcuma Longa (Turmeric) Root ExtractCorallina Officinalis ExtractTremella Fuciformis (Mushroom) Extract
D Tier: Potential IrritantsBe Cautious
Ethylhexylglycerin
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DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.