The brand operates on a single philosophy, prevent, protect, correct, and every formula is built around three things: a documented mechanism, stable actives at concentrations the published research supports, and delivery systems that keep those actives working once they are on skin. That clinical discipline is why the line has been a dermatology-office staple for decades.

Yes. It was developed for dermatology and medical aesthetics practices and continues to distribute through those channels alongside authorized online retailers. You are getting the same formulas and concentrations a clinic would dispense, nothing reformulated for consumer retail.

It comes down to skin type. C E Ferulic® is the flagship and the formula most cited in published studies, best on normal to dry skin. Phloretin CF® is the oily and combination-skin version with a lighter finish. Serum 10 AOX+ is the gentler entry point for sensitive skin or anyone using vitamin C for the first time. Our C E Ferulic vs Phloretin CF guide goes deeper.

Several formulas are designed for reactive and easily irritated skin. Phyto Corrective Gel and Hydrating B5 Gel are common starting points. Introduce one active at a time, give your skin two to three weeks to adjust before adding the next product, and patch-test before applying anything new to the full face.

Yes, most routines blend brands. Standard layering order: cleanser, antioxidant serum, targeted treatment, moisturizer, SPF in the morning; cleanser, treatment, moisturizer at night. Thinnest textures go on first. If you are using a retinol and an acid exfoliant, alternate nights rather than layering them on the same evening.