How to use Rosemary oil mixed with hair carrier oil: 1- Mix 5 drops of rosemary yaru oil with a carrier oil such as jojoba yaru oil or coconut yaru oil. 2- Massage your scalp well with the mixture. 3- Leave the oil on your scalp for 5 to 10 minutes. 4- Rinse your hair from the oil with warm water and shampoo. Information you should know before using rosemary oil 1- Avoid getting rosemary oil in your eyes, and in case of contact, rinse your eyes quickly with cold water. 2- Make sure not to use too much on your scalp, because it causes skin irritation. 3- It is not recommended to use rosemary oil during pregnancy.