A sensible starting point is a patch test to check for sensitivity. Apply a small amount of a diluted blend (1 drop of this oil mixed with a teaspoon of a neutral carrier oil like jojoba or sweet almond oil) to a small area of clean skin on your inner forearm. Leave it for 24 hours and observe for any redness, itching, or discomfort. If none occurs, you can proceed with a broader application.
For regular use, it should be diluted in a carrier oil, lotion, or other cosmetic base before applying to the skin or hair. A common starting dilution for cosmetic use is 1-2 drops of this essential oil per 5 ml (approximately 1 teaspoon) of your base. For the face or sensitive areas, use the lower end of that range. For skin that looks uneven or feels dehydrated, you could blend it into your daily moisturizer. For hair, you might add a drop or two to a portion of your conditioner or a few drops to a hair oil for the ends to help them feel smoother and look less dull. Never apply undiluted oil directly to the skin or scalp, and avoid contact with eyes and mucous membranes.