Due to their low molecular weight, essential oils are absorbed through the skin and hair follicles. Absorption can take between 15 minutes and 12 hours. However, most essential oils must be diluted in a carrier oil before being topically applied to the skin. The carrier oil used to dilute the essential oils directly affects the absorption rate of the mixture since some carrier oils are heavier than others.”he front of my hairline and top of scalp the night before I wash I my hair in the morning. On the alternate days…I apply very, very sparingly and use a natural dry shampoo for a little help absorbing the oil that inevitably coats strands of hair.