Our 5-in-1 Facial Firming Serum contains vitamin E, collagen. It can help stimulate collagen production, which is essential for the elasticity and firmness of the skin. The way to use it is simple: after cleansing and toning, take an appropriate amount of essence in the palm of your hand, apply it evenly to the face, and gently massage it into a circular motion with your fingertips. Use daily for best results. And it can increase the skin's moisture levels, resulting in a healthy, bright complexion.