Strictly Organics Vitamin C Serum is undoubtedly the best vitamin c serum for oily skin that is perfect for those who want to keep their skin glowing. It contains multi-active organic ingredients like Ethyl Ascorbic Acid, Hyaluronic Acid, Niacinamide, Neroli, and Aloe Vera leaf extract which are known for their vast array of benefits and can even help with aging.