'Age Defender' Power SerumKiehl's Age Defender Power Serum is a powerful treatment that provides you with a first line of defense against the effects of aging. It's formulated with cypress extract, an ultra lightweight age defender that helps to visibly firm sagging skin and reduce the appearance of wrinkles for a more youthful, resilient appearance. It boosts the efficacy of your moisturizer, absorbs quickly and targets specific concerns with its highly concentrated formula.