That same little bottle of retinol serum sitting on your bathroom counter - how does it work? Does it actually work? Those are the questions we’re taking on in part two of our retinoids two-parter. The answers, as you might expect, are complicated. Because as it turns out, “retinoid” is a catch-all term for a bunch of different types of compounds, all of which work in slightly different ways. And on top of that, the testing required to demonstrate efficacy isn’t exactly held to the highest of standards. But we do the best with what we have to get to the bottom of this retinoid puzzle. Tune in to learn everything you ever wanted to know about retinoids.

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