After a week of using it both morning (and eventually night, too), I was pleased that there was no irritation nor breakouts to report — although, I have to admit having what I described as quite resilient “rhino skin” to my aforementioned team of fellow beauty editors. It may be too soon to call, but I could swear my overall complexion did look more radiant and lit from within. When it comes to vitamin C serums, a 25% concentration (this one comes in the form of tetrahexyldecyl ascorbate, a highly stable form of vitamin C that’s in the same family of L-ascorbic acid) is probably the most I’ve tried in a product. Surprisingly, nothing felt too intense for my skin — which is something that’s happened before with powdered vitamin C boosters. This is no accident; while it doesn’t have the same name recognition as vitamin C, the glutathione in the formula helps minimize irritation and enhance the stability of its other ingredients. Plus, the airless pump (which is made with 50% post-consumer recycled plastic) helps keep the juice fresh by the time it reaches your skin.