People with tree nut allergies should avoid using macadamia oil.

Macadamia oil is an ingredient in many skin care products, but can a person also apply the pure oil directly to the skin. It is important to test the oil on a small area of the skin first. Although macadamia oil is generally safe, some people may develop a rash after applying it directly to the skin.

Many people use pure macadamia oil to strengthen and condition their hair. Similarly to using olive oil, a person can take a small amount of the oil and rub it directly into their hair. It is generally best to let the oil soak into the hair for a short amount of time before rinsing out the excess.

People who use macadamia oil as a hair conditioner claim that it can help:

Strengthen hair
Smooth hair
Add shine
Make hair more manageable