I have SUPER sensitive skin. Resurface is one of the VERY few vitamin c products I’m able to use. I STILL only use it once a day, in the morning. At night, I have been using the “resurface retinol”. I would probably have less sensitivity if I was willing to use an oil, but I wear glasses, and I can’t make an oil work. I can use oils at night, but even then, I wait until close to bed. Am I just messy? I don’t know how those who wear glasses keep them “smear free” when using an oil 😵💫