I am currently using Acne System IV on my severe acne - Step 1 - Kavi Coral 2x per day, Step 2 - Toner in the evenings (sometimes in the mornings, too), Step 3 - Hyaluronic Acid 95 2x per day, Step 4 - SPF 30 2x per day. Once a week I use the Salicylic Acid 15 after Step 1. I recently purchased the Organic Sulfur, and my question is, where do I squeeze this in to the routine?