The latest innovation in skincare, skin growth factor, is the basis of Cytokines Top Ten Fluid Cell Renewal Complex, from Natura Bissé. The term comes from Greek: cyto, for cell and kinesia, for movement. By stimulating cell renewal, it repairs your skin and leaves it firmer and more youthful in appearance. In addition, this fluid contains skin growth factor in its most concentrated form15%. The high amount allows for deep penetration and optimum results. All skin types can apply once or twice a day, with the eye gel and the cream (available separately) for best results. .1-ounce pump.