There are a few things you need to know about the natural color of hair growth

We should know that in our body, the genes controlling hair color are very complex. In the process of hair color formation, genes can directly affect the precipitation of pigment, or indirectly regulate the apoptosis of pigment producing cells. These mutual influences eventually form our hair color.

Black

Black is the most common hair colour, with about three-quarters of the world's population having black hair, found in cities in Asia, Africa, Eastern Europe and the Americas.

However, although they are all black, there are some differences from region to region.  East and Southeast Asian and American Indians generally have thick, stiff hair, quite different from the curly black hair of Africans.

Brown

Brown hair is second only to black, accounting for about 11 percent, and is found in Europe, America and Oceania.

Blond

Blond hair is relatively rare, only concentrated in Western Europe, northern Europe and some countries and regions of Latin America.

In western culture, gold symbolizes beauty.  Blond hair is actually related to the evolution of skin color, because the sun didn't shine so strongly in Europe that there was no need for extra dark skin to protect against UV rays.  Lighter skin also promotes vitamin D production, which leads to lighter hair color.

Red

Red is a very rare hair color, only about one to two percent of the world, mainly in western and some northern parts of Europe.

The evolution of red hair is somewhat similar to that of blond hair, in that there is no need for black skin, so there is room for the redhead gene to evolve.

White

Grey hair occurs naturally with age. Europeans tend to go grey early, asians tend to go grey after the age of 40 or so, and Africans tend to keep their black hair intact after the age of 45.