Make sure if you ever wanted to try it that you use Henna that is Body art Quality (BAQ), because there are all type of kinds that have metalic salts in them, and when mixed with a relaxer or other chemicals in your hair strands, they can turn green or melt your hair
The BAQ kind is usally ordered online, or found at an indian store
---One of the most cooman brands is Jamila
But yea,
people like it so much because its a natural way to dye your hair, either redish, brownish, or black depending on if you use it with or without indigo
It also thickens the hair ( it coats the outside layer of the hair)
Make it stronger
Promotes shine ( because it seals the outside layer of the hair)
And it can make hair softer ( that depends on what you mix it with, and what you use afterwards)
People have alot of different mixtures, some peope add lemon and coffee and other stuff to get a color that they want
And some people, who dont really care about the color, but just want the benefits add just condioner, or yohurt or oils ( you still will get some color though)
The downside is, it can make the hair very dry, tangly, it smells, and takes a while to rinse out
But you can change that depending on how much you use, what you mix it with, and what you use after
Theres also something called Cassia obovata, for people with blond hair, and people who want the benefits of Henna, without any color.