Diluted eucalyptus oil may also be applied to the skin as a remedy for health problems such as arthritis and skin ulcers. Eucalyptus oil is also used to ease cold symptoms and provide respiratory health benefits. … Eucalyptus is often used as an essential oil with a diffuser for aromatherapy health benefits. The best carrier oils for essential oils include: Coconut oil. Almond oil. Jojoba oil.
Diffusers do come in different sizes, but these are usually in 100ml increments, and therefore calculating the number of drops of essential oil to add is relatively easy. The smallest, 100ml diffusers will take 3-5 drops on average, while the largest, 500ml diffusers will require 15-20 drops.