vitamin-c-serums
C.E.O. 15% Vitamin C Brightening Serum
While the airless pump packaging is excellent and THD Ascorbate is a highly stable, premium derivative, it lacks the 'Duke Parameters' (L-AA + E + Ferulic) that define the clinical gold standard for this category. The inclusion of fragrance and a high luxury markup for a derivative-based serum makes it a poor value proposition compared to more effective, clinically-aligned formulas.
Sources & References
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