Glass skin — you’ve either used the phrase yourself, seen TikToks about it or Googled how to achieve it. Rooted in K-beauty culture, “glass skin” refers to a smooth, clear, practically poreless complexion, and while it’s a concept that’s been around forever, it wasn’t trendy until a few years ago. Alicia Yoon, founder and CEO of Peach & Lily, is partially responsible for that. When the brand’s Glass Skin Refining Serum came out in 2018, it sparked what she calls the glass skin movement. “It went so viral, to the point where I actually had to write an e-book on it,” says Yoon.

Just because you’re the mastermind behind glass skin doesn’t mean you’re automatically blessed with it, however — Yoon struggles with eczema, keratosis pilaris and sensitive skin just like the rest of us. I talked to the esthetician-turned-entrepreneur about what products she keeps in her skin care (and hair care) routine at all times, in addition to her go-to Peach & Lily products.

“Joanna Vargas is a fellow esthetician, and she was the one person I actually really trusted before my wedding many moons ago to do my skin care,” says Yoon. “She’s very custom in how she does things, and she approaches things in a way that I knew my eczema-prone skin would be safe with her.” Yoon adds Joanna Vargas’ The Daily Serum to her skin care routine occasionally, which she says is calming and hydrating since it’s made hyaluronic acid.