I love ayurvedic treatments. When I discovered how my hair benefit from this, I jumped on the band wagon and never hopped off.
My henna mix:
2 cups of henna
1/2 of cup of horsetail (shavegrass) herbal powder (for hair growth).
1 cup of castor oil (lock in moisture and enhance curl definition).
1/3 of conditioner, (your choice of conditioner) I use Millcreek botanicals.
Mix these up with hot water. Stir until the henna is a thick paste. Allow it to sit until cool. Apply in hair by sections. Then let it sit in the hair for 30mins-hour. Rinse out, and shampoo and condition.
Where you can purchase hair herbs and castor oil.