Sunday Riley C.E.O. 15% Vitamin C Serum with Phytosterols

Sunday Riley C.E.O. is a premium 15% THD Ascorbate vitamin C serum formulated with phytosterols complex (40%+ beta-sitosterol) to reduce redness and sensitivity. The formula targets visible brightening, clarifying, and antioxidant protection against environmental stressors and early aging signs.

Key traits:

• Form & strength: 15% THD Ascorbate (a stable, effective C derivative)
• Supporting actives: Phytosterols (soothing, anti-inflammatory)
• Packaging: Dark glass bottle (opaque, protects from oxidation)
• Size: 1 fl oz (30 mL)
• Suitable for: All skin types

Position: Sunday Riley is a prestige beauty brand with cult following; the C.E.O. serum ranks among the most-reviewed vitamin C serums on Amazon and holds steady 4.3–4.4★ ratings. At $51 (Prime deal) or $85 (list), it commands a premium price per oz (~$51–85/oz), positioning it mid-to-high in the category. Community sentiment is largely positive, though some users note the formula can feel sticky and oxidizes if stored improperly. The phytosterols angle differentiates it from pure C+E+ferulic stacks, making it a gentle alternative for reactive skin.