Theorem Serum Boost:The Serum has humectant qualities as well as a Growth Factor in it, so it creates super moisturization and glow immediately and builds firmness and smoother texture over time. Our Serum is highly likely to be superior to other serums you’ve tried because the formulation is specifically designed to meet the specific needs of adult women’s skin – optimized for women 40 – 65 and beyond). But yes please continue to use your moisturizer or sunscreens over the caire serum. Caire skincare is designed to play nicely with others. Triple Lift Molecule Mask:Our Mask’s #1 purpose is to give you a deep and super powerful infusion of moisture and skin-strengthening HA molecules. It can help instantly (well after 15 – 20 minutes use that is!) smooth lines and wrinkles; help lift up undereye bags and reduce redness & other signals of skin inflammation. We strongly recommend that you use the Mask 2 times weekly. But if you would prefer to use our Mask 1x a week and another mask another time, that would not be a problem.