Kiehl’s Since 1851 introduces a new and improved Powerful-Strength Line-Reducing formula, increasing the concentration of Vitamin C to 12.5% and adding Hyaluronic Acid. The original formula has long been a sought-after customer favorite, selling at a rate of over one per minute around the world with over 5 million bottles sold to date. Due to the difficulty of stabilizing Vitamin C, improving the formula was no small feat. But with careful formulation trials and their expertise in working with Vitamin C, Kiehl’s chemists developed a new formula with an even more powerful, clinically-demonstrated1 performance.

Committed to creating award-winning and beneficial products for its customers, Kiehl’s has taken diligent measures to make the anti-aging serum even more powerful than ever before. The final formulation was determined after 89 distinct formula variations were trialed over 10 months of dedicated work. The result is a powerful, optimized formula that delivers improved efficacy and a pleasant application experience.