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Kiehl’s Increases Concentration of Vitamin C in Popular Serum

Rolling out next-generation of its Powerful-Strength Line-Reducing Concentrate., with 12.5% vitamin C.

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By: Christine Esposito

Editor-in-Chief

Back in 2005, Kiehl's launched its Powerful-Strength Line-Reducing Concentrate, which had 10.5% pure, stabilized Vitamin C. The  formula has remained one of the brand's most popular for more than a decade, selling  a rate of one per minute around the world, with more than 5 million bottles sold to date, according to the company. Now after 89 trials, the company is rolling out the next generation of its Vitamin C-infused formula, billed as the company's largest formula renovatio...

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