Hygiene and health Essential oils Health Aid Citronella Oil (Cymbopogon nardus) 10 ml 10 ml Citronella Oil (Cymbopogon nardus) 10mlis a sharp and lemony fragrance, excellent as an air freshener. This uplifting oil repels insects and is deodourising and excellent for use in vapourisers. Pure essential oils can be used as essences in the bath or in vaporisers. They can also be used to make up your own massage blends having first diluted them in HealthAid massage oil base or lotion base.