Epidermal skin cells are responsible for skin cell replenishment. As we age, epidermal cells take 50% longer to be replaced. One scientific study showed that epidermal stem cells’ ability to form colonies (a key measure of their vitality) increased as much as 75% when penetrated with a 0.15% Alpine rose stem cell extract, indicating their potential for renewal. Skin penetrated with an extract of Alpine rose stem cells is better able to fend off environmental stress and stay more vibrant.