Renergie C.R.x Triple Serum Retinol

This is a three-chamber serum that keeps retinol, vitamin C, and a peptide-ceramide blend separated until you mix them fresh at each use, which helps keep the retinol and vitamin C stable. The retinol chamber also includes retinyl palmitate and niacinamide, while the ceramide chamber (ceramide AP, EOP, and NP) is meant to reinforce the barrier against irritation from the actives. A higher-maintenance format aimed at people who want potent actives without the instability issues of combining them in one bottle.