Keratin is a fibrous protein that is found in the outermost layer of skin, called the epidermis. It is also found in hair, nails, and other parts of the body. Keratin provides strength and protection to these tissues.

Here's how it works:

* Keratinocytes: These are the cells that make up the epidermis.

* Keratinization: As keratinocytes mature, they produce keratin, which fills the cell and pushes the nucleus and other organelles to the periphery.

* Hardening: The accumulation of keratin within the cells makes them hard and tough, forming a protective barrier.

So, keratin is the key player in making our skin tough and resilient!