I use a Henna I bought at the Indian store it's called "Atul Henna" and there is Shikaki, Katha and Amla powder in it
. One bag costs me $2.99 and that is good for about 2-3 applications.
I use it once a week everytime I wash my hair I mix it with plain full fat yogurt, hot water, olive oil and castor oil. I base my hair and scalp with coconut oil so my hair won't dry out as quickly and my hair is freshly washed (with shampoo) before application. I LOVE the colour and my hair feels super healthy.
I've only done this twice (I used to do it before, but that was only once a month) weekly, I'm doing more often to see if I can get a growth spurt. I'm hoping to be FULL APL by this Christmas (right now the longest part of my hair passes APL)