These essential oils are scientifically proven to help in hair growth. You will thick black hair. It will stimulate hair follicles in scalp to grow new hairs. New coming hairs will be thick and black and have very strong roots. This will improve your hair volume.

What you will need to do this “Oil Mix” therapy:

• One career oil, the base oil. I use Coconut oil as the career. 50 ml.
• Jojoba oil – 1 tablespoon
• Rosemary Essential oil – 1 teaspoon
• Peppermint Oil – 1 teaspoon

Take glass bottle, and pour all of the listed above oils in same quantity and mix them together.
Massage your scalp with the mix of oils everyday for one week. After one week use this oil mix 3 times a week.
Every time you use this oil, massage your scalp with your fingers then spread the oil on your hairs. Comb your hairs so oil can spread evenly.

Reference

https://glowpink.com/blog/jojoba-oil/