The EGF Tone is a toner that can be used morning or night. The skin goes through a natural process where it sloughs off skin in cycles. As you get older the cycles get longer and therefore the skin takes a much longer time to rejuvenate itself. The use of epidermal growth factor is to normalize the skin cycle rate. You can also use the EGF series after exfoliation to speed up healing. When applied to the skin, epidermal growth factor accelerates healing and increases the rate of skin renewal on aging skin. We have also noticed, the more aged the skin, the more dramatic the response.