Ancient Text Lists Benefits of Oil Applied to the Head

"One who applies oil on his head regularly does not suffer from headache, baldness, graying of hair, nor does his hair fall. Strength of his head and forehead is especially enhanced; his hair becomes black, long and deep-rooted; his sense organs work properly; the skin of his face becomes brightened; applying oil on the head produces sound sleep and happiness."

Ayurvedic physician Charaka, in the first text on Ayurveda, written over 2000 years ago.