Vitamin C Serum Showdown: C20 vs. C21.5

C20 vs C21.5

It is a truth universally acknowledged that I'm lazy as hell. Well, not lazy precisely, but resistant to adding more work to my day that's not absolutely necessary. Lazy. So when I recommend thinking about adding a longass, annoying step to your skincare routine, it's only because I've done a lot of ...

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