Unless you understand this, your vitamin C purchases are futile.

Of all the skincare ingredients I love (and there are many—niacinamide, peptides, retinoids, need I go on?), vitamin C might be the one I love the most. That’s for two reasons. The first is that it’s a true multitasker, and it has myriad benefits (but more on that in a minute). The second is that it’s made…

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