What I do in the morning is start off with the Good Genes and then the Vitamin C (CEO)
and finish with a sunscreen. You can use any serum after the Good Genes. I also use the eye cream. In the evening it's the Good Genes, Luna (a retinoid oil) and then a moisturizer (Ice). I just ordered the Ice. I only use Sunday Riley and I really like it. My face has never looked better. Hope this helps. Sunday says to use the serums before moisturizer so the serums can sink into your skin without any barrier getting in the way.