Some essential oils that encourage healthy hair growth include cedarwood and rosemary, according to WebMD. Oils such as geranium, jojoba and lavender also help the hair by moisturizing it, strengthening it, giving it shine or adding nutrients.
Skin experts recommend diluting essential oils before applying them to the scalp, as they may cause some people to experience an allergic reaction, reports WebMD. One to dilute them is to mix a few drops of each oil with shampoo or conditioner. Individuals can also dilute their essential oils by mixing them with a carrier oil, such as grapeseed oil, notes the University of Maryland Medical Center.