Author name: Dr. Lianne Cortez, PhD

Dr. Lianne Cortez is a cosmetic chemist with over 12 years of experience in formulation science, specializing in active ingredients for skin barrier repair, pigmentation control, and anti-aging cosmetics. She earned her PhD in Chemical Engineering with a focus on Colloidal Systems and has worked as a consultant for both multinational beauty brands and indie skincare startups. At Active Ingredient Hub, Dr. Cortez breaks down complex cosmetic ingredients—like peptides, ceramides, and retinoids—into clear, evidence-based explanations that professionals and consumers alike can trust. Her writing is grounded in peer-reviewed studies, regulatory guidance, and hands-on lab experience, ensuring accuracy and transparency. Outside the lab, Lianne enjoys weekend hiking, watercolor painting, and experimenting with minimalist skincare routines. She’s also passionate about consumer education, believing that understanding what goes into a product empowers safer and smarter beauty choices.

Cosmetics

Creams With Tretinoin vs. Adapalene: Comparing Active Retinoid Strengths

Dr. Lianne Cortez, PhD

From a formulation perspective, few active ingredients command as much respect in the lab, or cause as much debate in the skincare community, as topical retinoids. Throughout my years as a cosmetic chemist analyzing barrier function and cellular turnover, I have seen endless consumers struggle to navigate the delicate balance between maximum efficacy and manageable […]

Cosmetics

ADVANCEMENTS IN NANOTECHNOLOGY-BASED SUNSCREENS AND INSIGHTS ABOUT SUNSCREEN APPLICATION

Dr. Lianne Cortez, PhD

As a cosmetic chemist who has spent over a decade analyzing the molecular behavior of emulsions, I’ve seen firsthand how the “white cast” problem has historically been the greatest barrier to sunscreen compliance. In my early lab days, working with traditional inorganic filters often felt like a trade-off: you could have high-level protection, but you