Shampoo, conditioner, moisturizer, gel, mousse, serum the list goes on and on.
There are so many products needed to maintain healthy and voluminous hair.
Should oil be on that list?

Adding hair oil to your routine promotes healthy hair (viaHealthline).
Using hair oil is a common practice in India, often recommended in Ayurvedic medicine.
It’s simply a matter of applying your oil of choice and massaging it into your scalp.

Applying oil to your hair has a multitude of benefits, perForbes.
Other benefits of hair oil
What oil should you use on your hair?
Select an oil based on your particular needs so that your hair receives the necessary nutrients and vitamins.
According toVogue India, oiling the hair stimulates growth and protects against heat damage.
PerByrdie, this oil is great for boosting shine and scalp health.