What is cedar wood essential oil used for?

Skin, hair,asthma. For therapeutic purposes moroccon cedarwood should be used only. It is in shampoos and hair lotions for alopecia (hair loss) good for eczema, dermatitis, skin rashes. Good for inhalation for asthma, bronchitis, hay fever. For external use only ( not to be swallowed).
Anything apparently. By definition, "alternative" is different than modern western medicine. Generally any drug, herb, treatment, or oil that stands up to rigorous scientific scrutiny is included in modern medicine. Many alternative practices, oils etc do not stand up to scientific scrutiny and cannot be shown to work. 'course the people who sell them make big $$$. Check https://nccih.nih.gov/ for research.
Many things. Cedar wood essential oil is from the juniperus virginiana. It has been used as an antiseptic, a fungicide & as an astringent. It has been beneficial for seborrhea, acne & dandruff. Other purported uses: insecticide, antispasmotic, diuretic, sedative, expectorant and sedative.