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How Retinoids Actually Work: Retinol, Retinal, Tretinoin—and Why HPR Is Next Generation Part 1
Retinol isn’t the only retinoid—but before we talk about the newer ones, you need to understand how the classics work. In this Short, I explain the differences between retinol, retinal (retinaldehyde), and prescription tretinoin, including how each converts into retinoic acid, why they’re different strengths, and what that means for your ...
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