After cleansing and toning your face, take 2-3 drops of Vitamin C serum on your fingertips with the dropper. Apply it on the face by gently tapping it on the skin. With a circular motion, evenly spread the serum and allow your skin to absorb it.When to use: AM & PM. Everyday|||How To Use:-A skin-brightening daily serum with stable Vitamin C at 15% and antioxidants (Vitamin E & Ferulic Acid) at 1% combined.