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[ DemythSkin Verdict ]

numbuzin

Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum

Name: Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum
Brand: numbuzin

SerumBrightening

Efficacy

Strong

4.2 / 5.0

Safety

Mostly Safe

4.2 / 5.0

System Verdict

This is a well-formulated brightening and hydrating serum with a credible mix of proven actives, but the marketing around glutathione and "sun" framing oversells what it can realistically do. The efficacy score is driven primarily by high-position niacinamide for brightening and barrier support, layered humectants (glycerin, hydroxyethyl urea, betaine, sodium hyaluronate) for hydration, and a cluster of supportive actives like tranexamic acid, polyhydroxy acid (gluconolactone), gentle salicylic derivative (capryloyl salicylic acid), panthenol, vitamin C (ascorbic acid and ascorbyl glucoside), vitamin E, coenzyme Q10, and licorice derivative for tone and antioxidant protection. These treatment ingredients sit mostly in the mid-to-lower half of the INCI, suggesting moderate but plausible concentrations appropriate for daily use rather than clinic-level strength, so it should help uneven tone over time but not transform melasma or deep hyperpigmentation. The presence of denatured alcohol and BHT is acceptable for most users and helps texture and antioxidant stability, but nudges the safety score down slightly, especially for very sensitive or compromised skin, and there are no UV filters here, so it functions strictly as a tone-improving serum, not a sunscreen despite the "sun serum" language.

Active Ingredients Detected

S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative

Ascorbic AcidTranexamic Acid

A Tier: Good BasicsProven Results

NiacinamideGlycerinHydroxyethyl UreaBetainePanthenolGluconolactoneSodium HyaluronateTocopherolCapryloyl Salicylic AcidAscorbyl GlucosideUbiquinonePyridoxine HClCyanocobalamin

B Tier: Supporting IngredientsPromising Ingredients

Diethoxyethyl SuccinateHydroxyacetophenoneMaltodextrinDipotassium GlycyrrhizatePantolactoneMagnesium ChlorideAlcoholCalcium GluconateBHT

C Tier: Marketing IdolsHype | Limited or Weak Data

Gardenia Florida Fruit ExtractTremella Fuciformis (Mushroom) ExtractGlutathioneYeast Extract

What Each Ingredient Does

Water: solvent base
Niacinamide: brightening and barrier support
Dipropylene Glycol: solvent and texture enhancer
Glycerin: humectant for hydration
Propanediol: solvent and humectant
Butylene Glycol: humectant and solvent
Hydroxyethyl Urea: hydrating humectant
Diethoxyethyl Succinate: texture and emollient aid
Hydroxyacetophenone: antioxidant preservative booster
Caprylyl Glycol: humectant and preservative booster
Polyglyceryl-10 Laurate: emulsifier and surfactant
Betaine: osmotic humectant
Citric Acid: pH adjuster and mild chelator
Panthenol: soothing humectant
Ethylhexylglycerin: preservative booster and humectant
Gluconolactone: polyhydroxy acid and humectant
Sodium Polyacrylate: thickener and film former
Disodium EDTA: chelator for stability
Ammonium Acryloyldimethyltaurate/VP Copolymer: film former and thickener
Sodium Citrate: buffer and chelating agent
Maltodextrin: stabilizer and carrier
1,2-Hexanediol: solvent and preservative booster
Gardenia Florida Fruit Extract: botanical antioxidant and colorant
Dipotassium Glycyrrhizate: soothing and anti-redness agent

Full Ingredient List (INCI)

Water, Niacinamide, Dipropylene Glycol, Glycerin, Propanediol, Butylene Glycol, Hydroxyethyl Urea, Diethoxyethyl Succinate, Hydroxyacetophenone, Caprylyl Glycol, Polyglyceryl-10 Laurate, Betaine, Citric Acid, Panthenol, Ethylhexylglycerin, Gluconolactone, Sodium Polyacrylate, Disodium EDTA, Ammonium Acryloyldimethyltaurate/VP Copolymer, Sodium Citrate, Maltodextrin, 1,2-Hexanediol, Gardenia Florida Fruit Extract, Dipotassium Glycyrrhizate, Sodium Hyaluronate, Ascorbic Acid, Pantolactone, Tocopherol, Capryloyl Salicylic Acid, Tranexamic Acid, Tremella Fuciformis (Mushroom) Extract, Caprylic/Capric Triglyceride, Ascorbyl Glucoside, Ubiquinone, Hydrogenated Lecithin, Magnesium Chloride, Alcohol, Glutathione, Polysorbate 80, Calcium Gluconate, Pyridoxine HCl, BHT, Yeast Extract, Cyanocobalamin.

Frequently Asked

Is Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum worth it?

Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum scores 4.2 out of 5.0 for efficacy (Strong) and 4.2 out of 5.0 for safety (Mostly Safe) on DemythSkin's independent ingredient analysis. This is a well-formulated brightening and hydrating serum with a credible mix of proven actives, but the marketing around glutathione and "sun" framing oversells what it can realistically do. The efficacy score is driven

What are the key active ingredients in Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum?

Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum contains these gold-standard actives with strong clinical evidence: Ascorbic Acid, Tranexamic Acid.

Does Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum. It scores 4.2 out of 5.0 for safety.

How is Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum scored?

DemythSkin grades every product on two independent axes: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are classified S through D against a database of over 3,000 compounds. No brand pays for a score.

Analyze on DemythSkin →

Analysis last updated: 2026-08-25. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.