Think your skin’s surface is just for show? Think again!

Your epidermis—the outermost layer of skin—is a fierce protector, working 24/7 to defend you against everything the world throws your way.

Scientifically speaking, the epidermis is a multilayered structure, mostly made of specialized cells called keratinocytes. These hardworking cells are true heroes: they create keratin, a fibrous protein that gives your skin strength and resilience. In fact, keratin makes up about 80% of the proteins in the epidermis¹.

Other key players?

Melanocytes: These pigment-producing cells synthesize melanin, which protects your skin from UV radiation².

Langerhans cells: Acting like skin’s security guards, they detect harmful invaders and trigger immune defenses³.

Merkel cells: Tiny but mighty, they help you feel touch, pressure, and texture².

But it doesn’t stop there. Your epidermis has a self-renewal process that’s pure magic: every 28 days, your skin completely regenerates⁴. New keratinocytes are born in the deepest layer (the stratum basale) and slowly push upward, transforming along the way, until they reach the surface as corneocytes—dead cells ready to be naturally shed⁴.

This perfect cycle ensures your skin stays smooth, strong, and hydrated. However, aging, pollution, and stress can slow down this renewal, leading to dullness, dryness, and fine lines⁵.

That’s why maintaining your skin’s barrier isn’t optional—it’s essential. professional skincare, packed with ingredients like resilient hyaluronic acid, can strengthen the stratum corneum (your top skin layer) and lock in precious hydration.

Bottom line? Your epidermis is your body’s frontline hero. Give it the science-backed care it deserves!

Laure Peslerbe

Dermocosmetics Product Marketing Manager

CH