Pure Sweet Wormwood Oil (Artemisia annua) Sweet Wormwood Oil is the source of the Traditional Chinese Medicine (TCM) ‘Qing Hao’, which has been used for more than 2,000 years to alleviate fevers. In TCM it is often prescribed in combination with other herbs to treat (in addition to fevers) jaundice, headache, dizziness and nosebleeds. Sweet Wormwood Oil is also valued for its essential oil which is sometimes used in cosmetics and perfumes. The oil has been reported to have anti-microbial activity. Sweet Wormwood Oil is also grown locally as an ornamental in Java, Indonesia.