Wash the curry leaves and blend in a mixer with little water to make it juicy. Strain this to extract the juices.
Heat oil in a pan and add the juice. Heat on simmer for few minutes, stirring frequently. The water content in the curry leaves juice gets evaporated and the juice forms into a dark translucent residue at the bottom.
Turn off the stove and allow the oil to cool to room temperature. Transfer the oil into a bottle. Shake the bottle well and apply on hair a little quantity daily.
Massage on scalp to prevent hair fall and graying.