++++
[ DemythSkin Verdict ]

numbuzin No.5 Goodbye Blemish Serum
SerumBrightening
Efficacy
Strong
4.0 / 5.0
Safety
Caution
3.7 / 5.0
System Verdict
This is a potent brightening/antioxidant serum with a smart niacinamide + multi–vitamin C stack, dragged down by unnecessary fragrant citrus oils. Efficacy is solid because niacinamide is high in the INCI and supported by several vitamin C derivatives plus sea buckthorn and licorice, but the large number of actives are likely in moderate-to-low concentrations in a very hydrating, gel-heavy base, so results will be gradual rather than dramatic; safety is good for most, but essential oils and fragrance allergens prevent this from being S Tier for sensitive or acne-inflamed skin.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Ascorbic Acid
A Tier: Good BasicsProven Results
WaterGlycerinNiacinamideAllantoinPanthenolSodium HyaluronateAscorbyl Glucoside3-O-Ethyl Ascorbic Acid
B Tier: Supporting IngredientsPromising Ingredients
Butylene GlycolMethyl Gluceth-20Dipropylene Glycol1,2-HexanediolHippophae Rhamnoides ExtractGlycereth-26Ammonium Acryloyldimethyltaurate/VP CopolymerPolyglyceryl-10 LaurateCarbomerTromethamineDipotassium GlycyrrhizateDisodium EDTAHydrolyzed Jojoba EstersCentella Asiatica ExtractCamellia Sinensis Leaf Extract
C Tier: Marketing IdolsHype | Limited or Weak Data
Melia Azadirachta Flower ExtractOcimum Sanctum Leaf ExtractMelia Azadirachta Leaf ExtractCurcuma Longa (Turmeric) Root ExtractCorallina Officinalis ExtractGlycyrrhiza Glabra (Licorice) Root ExtractPolygonum Cuspidatum Root ExtractScutellaria Baicalensis Root ExtractChamomilla Recutita (Matricaria) Flower ExtractRosmarinus Officinalis (Rosemary) Leaf Extract
D Tier: Potential IrritantsBe Cautious
Citrus Limon (Lemon) Peel OilCitrus Aurantium Dulcis (Orange) Peel OilCitrus Aurantifolia (Lime) OilLimoneneCitral
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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.