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Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum ingredients: is it worth it?
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.
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.
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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.
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DemythSkin rates Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum 4.2/5 for efficacy and 4.2/5 for safety.
ACTIVE INGREDIENTS BY TIER
Gold Standards
High clinical proof | Skin-transformativeReliable
Proven resultsPotent
Developing evidenceOverhyped | Marketing
Hype | Limited dataDocumented Irritants
Evidence-backed flagFORMULATION BASE (16)⌄
FULL INGREDIENT LIST⌄
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.
WHAT EACH INGREDIENT DOES (24)⌄
- 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
EXTERNAL CITATIONS
Niacinamide: Draelos ZD. The effect of 2% niacinamide on facial skin texture and hyperpigmentation. J Cosmet Dermatol. 2006.
Tranexamic Acid: Li YH et al. Tranexamic acid in the treatment of melasma: a review. J Eur Acad Dermatol Venereol. 2014.
Gluconolactone: Green BA et al. Clinical effects of gluconolactone-containing polyhydroxy acids. Am J Cosmet Surg. 2004.
Capryloyl Salicylic Acid: Dreno B et al. Pseudoacne and salicylic acid derivative in cosmetic formulation. J Eur Acad Dermatol Venereol. 2011.
Ascorbyl Glucoside: Hakozaki T et al. Evaluation of ascorbyl glucoside as a vitamin C derivative in skincare. Int J Cosmet Sci. 1999.
DISCLAIMER: THIS ANALYSIS IS FOR INFORMATION ONLY. NOT MEDICAL ADVICE. AI-GENERATED DATA BASED ON PUBLICLY AVAILABLE INGREDIENT LISTS. VERIFY WITH A MEDICAL PROFESSIONAL.
Numbuzin No.5 Glutathione Vitamin Tone Up Sun Serum: common questions
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 (Effective) and 4.2 out of 5.0 for safety (Gentle) 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.
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 scores: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are graded S through D against a database of over 3,000 compounds. Brand and price are not part of the score, and no brand pays for one.
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