Your skin barrier comprises four layers that work together: the physical, chemical, microbiome, and immunological layers.

Learn how proper layering and timing can maximize your skincare results and transform your routine into a beauty investment.

Karl Koehler builds inner ear and skin organoids from human stem cells to model their development in health and disease.

Growing cells in the laboratory is an art that humans have mastered decades ago. Recreating entire three-dimensional tissues is much more challenging.

When did skin care get so … complicated ... the products and allowing more time for them to dry between application layers.