* Black is likely the most common natural hair color globally, as it's prevalent in many regions of the world.
* Brown is also very common naturally, making it a strong contender for the most used hair color.
* Blonde is less prevalent naturally but is popular as a dyed color, especially in Western cultures.
Important Factors to Consider:
* Regional Variations: Hair color prevalence varies greatly across regions and countries.
* Cultural Preferences: Certain hair colors are more desirable in different cultures.
* Dyeing Trends: Fashion and trends significantly influence the popularity of specific hair colors.
Overall, it's safe to say that the most used hair color is likely a combination of natural black and brown hair, as well as dyed blonde, depending on the location and cultural context.