Polypodium leucotomos is a type of fern. Ferns have long since lived in the sea.
They used to live in the sea, but over a long evolutionary process, they moved from the sea to land.

To live on land, we must protect ourselves from the ultraviolet rays that pour down on us.
Therefore, they developed and acquired their own mechanisms to protect themselves from ultraviolet radiation.

The UV protection mechanism that ferns have acquired is the activation of "Nrf2"!
Nrf2 is said to switch on various genes involved in UV protection.

Nrf2 is a type of protein that, upon sensing UV damage, activates hundreds of genes involved in antioxidant, anti-inflammatory, moisturizing, and repair processes.

In other words, Nrf2 is the "command center" that activates the necessary defense mechanisms when exposed to ultraviolet light!
Ferns such as Polypodium leucotomos and broccoli contain components that enhance Nrf2 activity.