Retinol Serum 1 is the first step in Environ's Step Up System. Formulated with a high concentration of Vitamin A, it helps to normalize the appearance of skin abnormalities and damage, and promote healthy-looking skin.  Assists in improving the appearance of uneven skin tone Helps to refine the look skin texture, giving your skin a firmer, smoother appearance. Assists in reducing and approving the appearance of premature aging and fine lines. Directions Start by adding 1 drop of retinol to your moisturizer each evening. As your skin gets comfortable with it, you can start to increase the amount of product until you can use it on its own. Use 2-4 bottles per step before going to the next step. 30 mL / 1.01 oz.  Warning: The skin may feel uncomfortable when first using Retinol 1 and this transient irritation of the skin may reoccur during each step-up in the Intensive Retinol regime. If an irritation (dry skin with a rash) should develop we recommend that the frequency of application be reduced from every day to alternative or even every third or fourth day until the skin becomes comfortable.