Obagi C10 Vitamin C Serum 12ml

Obagi C10 Vitamin C Serum 12ml is the most widely recommended product in the Obagi C Series — delivering 10% pure L-Ascorbic Acid for normal and combination skin with visible pores, uneven texture, early sun spots, and dullness. It is the core concentration in the Obagi C line and the appropriate starting point for most adults building a Vitamin C serum routine, providing meaningful brightening efficacy without the heightened sensitivity risk of higher concentrations.

• 10% pure L-Ascorbic Acid — the concentration shown in dermatological research to provide significant pore-refining and brightening results with manageable irritation risk
• Iris Root Extract (Deep C Porter) — facilitates delivery of L-Ascorbic Acid to the stratum corneum where melanin regulation occurs
• Tocopherol (Vitamin E) — synergistic antioxidant that extends Vitamin C's effective activity and supports moisture retention
• Centella Asiatica Extract — calming botanical that supports tolerability at this concentration
• Signal Lock Complex — stabilisation system that maintains potency across the 12ml bottle's use period
• 12ml — approximately 60 days at 3–4 drops per day; small size appropriate for L-Ascorbic Acid stability

How it works: At 10% concentration, L-Ascorbic Acid provides dual-mechanism brightening: it inhibits tyrosinase to prevent new melanin formation and it reduces already-oxidised melanin through direct antioxidant action. Deep C Porter (Iris Root Extract) improves penetration of the hydrophilic L-Ascorbic Acid molecule through the lipid-rich stratum corneum — addressing the key absorption limitation of pure Vitamin C that causes many formulas to produce only surface brightening rather than deeper correction.

C10 vs C5 vs C20: C5 for sensitive skin or first-time Vitamin C users with mild concerns. C10 (this product) for most adults — effective at pore refining, texture improvement, and dullness correction with acceptable tolerability. C20 for users who have used C10 consistently for 3+ months and want to address persistent dark spots or more advanced dullness. Escalate only when the current concentration no longer produces visible improvement.

Known in Japan as オバジ C10セラム 12ml.