i use it as a prepoo as well as in my moisturizing spritz. Here's something else about bhringaraj oil, it keeps dark hair from turning grey.
those with light/blonde hair have complained that the hair at the roots looks "dirty?" thus, it must be for just dark brown or black.
as for the growth? well, i'm a slow grower. I've been using bhringaraj for about 1 to 1 1/2 years. With the help of DHT blockers, i'm at an average of 1/2" a month. Before that w/the oil alone?.. not much difference in hair growth.
Be very careful with this oil. it's a greenish color. if you use too much and wear light clothes, it stains. I had an incident with it on my lab jackets. I didn't realize i had a light green color "halo" on the back of my neck which seeped out to the shoulders.
Working with a bunch of Russians/Iranians, i didn't find out about it until i was wondering what they were laughing at all day while i was seeing patients. When i took off my lab coat, i saw it.. hard way to learn a lesson.. thus, i hope someone learns from my experience.