So far so good
"I have been using the vitamin C for 2 weeks alongside the remainder of my skincueticals bottle. I am using one on either side of my face. Formulations seem to be very similar (color, smell, feel) - Brandefy is slightly greasier upon application but after a couple minutes there is little difference. I feel the two are giving similar results. Great dupe I will be switching to this for the next few months to continue seeing how it goes."