I answered something similar to this last week so I know this is confusing.  In general, put your antioxidant (C E Ferulic) under your sunscreen because it helps to prevent the damage from sun to your skin cells.  But it's not critical!  If you don't like the antioxidant in the morning, just use it at night instead either under the Renova, if your skin is tough enough, or alternate nights with the Renova and the C E Ferulic (antioxidant).  You can put the cell growth factors (Essential Serum) under your Renova or under your sunscreen.  The order of these isn't critical except that the sunscreen should always be in the morning (obvious I know!) and the Renova at night because light inactivates it. Here is a look into my daily skincare routine.  Dr. I