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[ DemythSkin Verdict ]

Cos De BAHA VA Vitamin C 15 Serum
SerumBrightening
Efficacy
Strong
4.3 / 5.0
Safety
Safe
4.6 / 5.0
System Verdict
This is a potent, no-frills antioxidant/brightening workhorse with impressive actives but mediocre stability safeguards and a slightly under-engineered base. You get S Tier L-ascorbic acid at a meaningful 15% plus A Tier arbutin and solid humectants (glycerin, sodium hyaluronate, panthenol) in the top half of the INCI, which justifies a high efficacy score for brightening and antioxidant protection. However, there is no dedicated water-free or silicone-based stabilizing system, no vitamin E/ferulic synergy, and very minimal antioxidant network beyond green tea and botanicals, so long‑term stability and real-world performance will lag behind gold-standard vitamin C serums. The relatively simple solvent-heavy base (propanediol + humectants) is functional but not sophisticated, and the absence of strong barrier lipids or multiple supporting antioxidants keeps it below true S Tier formulations.
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.