Whether you’re assembling a rainbow cake or putting together a skin-care routine, proper layering is essential. And the multistep regimens that have become synonymous with K-beauty (we're talking 10, 12, and even 17 steps) have turned the way we apply serum, moisturizer, and oil into an art form. To master it, Michelle and Jenny called upon dermatologist Marie Jhin to share some hard-and-fast rules for layering and to spell out exactly how — and when — to apply your skin-care products for maximum benefit.

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This episode of Allure: The Science of Beauty is presented by AHC.