Timeless Prescription MDI Firming Activator is a multi-functional toner whose ingredients work synergistically to counteract the signs of aging by promoting firmness and elasticity, while providing moisture that leaves skin looking young and healthy. The formula features MDI Complex, which promotes the skin's firmness, elasticity and smoothness. With age and exposure to various environmental stresses, the structure and barrier function of skin are compromised. This process involves the development of the appearance of wrinkles and can result in sagging skin. MDI Firming Activator works by locking moisture into the skin to help slow the appearance of aging.