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[ DemythSkin Verdict ]
Cos De BAHA VA Vitamin C 15 Serum Jumbo 7
SerumBrightening
Efficacy
Strong
4.2 / 5.0
Safety
Safe
4.3 / 5.0
System Verdict
High-octane but fragile: this is a potent, no-frills 15% L‑ascorbic acid brightening serum in a simple humectant base that delivers results but oxidizes fast and lacks the stabilizing support of top-tier formulas. Efficacy is strong because 15% pure ascorbic acid is an S Tier concentration for brightening and collagen support, further backed by A Tier arbutin and multiple antioxidants, but the bare-bones propanediol/aloe base without ferulic acid, vitamin E, or robust packaging control means you lose potency quickly and risk irritation in sensitive skin.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Ascorbic Acid
A Tier: Good BasicsProven Results
Aloe Barbadensis Leaf ExtractGlycerinArginineSodium HyaluronatePanthenol
B Tier: Supporting IngredientsPromising Ingredients
PropanediolArbutin1,2-HexanediolSodium HydroxideCamellia Sinensis Leaf ExtractDisodium EDTA
C Tier: Marketing IdolsHype | Limited or Weak Data
Momordica Charantia Fruit ExtractSambucus Nigra Flower ExtractLeontopodium Alpinum Extract
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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.