I have been very skeptical about vitamin c serums since I refuse to wear SPF daily, except for outdoors in the summer, of course…so I decided to use it only once daily, well overnight that is! Rodan + Fields’ vitamin c serum also includes a ginger derived anti oxidant. It works well for my menopausal wrinkled skin and it’s the first product in years to have moisturized my facial and neck skin overnight and stopped it completely from flaking and itching!