Kiehl’s Powerful‑Strength Vitamin C Serum

Engineered like a precision instrument, Powerful-Strength Line-Reducing Concentrate fuses 10 % pure L-ascorbic acid with 2.5 % ascorbyl glucoside and fragmented hyaluronic acid in a pH-balanced, anhydrous matrix. The moment the translucent gel meets skin, it liquefies into a weightless film, delivering a fleeting thermal signal that actives are penetrating deeply.

Within fourteen days, surface micro-relief appears 26 % smoother, crow’s-feet soften by nearly one third, and luminosity rises 21 %—metrics captured under clinical light imaging. Continued use amplifies dermal collagen density, tightens pore architecture, and disperses hyper-pigmentation without the inflammation typically associated with high-potency vitamin C.

The formula is encapsulated in an airless, UV-shielding amber glass cartridge that ejects an exact 0.5 ml dose, preserving antioxidant integrity for eighteen months. A fragrance-free, silicone-gel suspension dries to a velvet-matte finish, forming an invisible primer that grips foundation or sunscreen without pilling or shine.

Designed for every skin type—including the most reactive—the concentrate omits alcohol, fragrance, and common allergens while maintaining a gentle 3.5 pH. The result is a daily ritual that feels like silk, acts like a laser, and leaves the complexion camera-ready with effortless, minimalist sophistication.