I use the Q10 Therapy as the last product to go onto my skin, before the BB Creme. It just makes a huge difference to my skin, keeping it glowing (not shiny), and I feel it allows the other products to penetrate my skin better. It acts as a turbo to the other products! If I stop using it, I can feel a difference within 2 days, and my skin loses it's luster and feels and looks dull.