Cos De BAHA Arbutin 5% + Niacinamide 5% Serum — Efficacy 3.8/5.0, Safety 4.4/5.0 | DemythSkin
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[ DemythSkin Verdict ]
Cos De BAHA Arbutin 5% + Niacinamide 5% Serum

Cos De BAHA Arbutin 5% + Niacinamide 5% Serum

SerumBrightening
Efficacy
Solid
3.8 / 5.0
Safety
Safe
4.4 / 5.0
System Verdict
A solid brightening serum that does its core job well, but the formula is not as elegant as the headline actives suggest. The 5% arbutin + 5% niacinamide pairing is legitimately effective for discoloration and post-acne marks, and the base is supported by glycerin, sodium hyaluronate, and allantoin; however, the overall efficacy is held back from an S Tier score because the formula is mostly a hydrating/soothing vehicle with no advanced delivery system, and the botanical extras at the bottom of the list likely contribute little while increasing irritation risk. The result is strong B Tier to low A Tier performance rather than a truly optimized brightening treatment.
Active Ingredients Detected
A Tier: Good BasicsProven Results
Aloe Barbadensis Leaf ExtractNiacinamideGlycerinSodium HyaluronateAllantoin
B Tier: Supporting IngredientsPromising Ingredients
PropanediolArbutin1,2-HexanediolDipotassium Glycyrrhizate
C Tier: Marketing IdolsHype | Limited or Weak Data
Hamamelis Virginiana (Witch Hazel) Leaf ExtractRosmarinus Officinalis (Rosemary) ExtractEucalyptus Globulus Leaf ExtractThymus Vulgaris (Thyme) ExtractAspalathus Linearis 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.