Avesta Herbal Products of Skipton, North Yorkshire, have produced a blend of essential oils specifically to combat the udder disease mastitis. Containing lavendar, eucalyptus, gernaium and damask, it often clears up the infection within two to three days. No antibiotics or drugs get into the cow's blood or milk, and there are no side effects (except that the milking parlour smells a lot nicer and the farmer has softer hands!).