Scientists from the Universities of Southampton and Reading have embarked on groundbreaking three-year human trials seeking to establish whether drinking cow's milk can help boost the human body's immune system. Following on from successful experiments conducted on mice and rats in the US, the British scientists are focusing on conjugated linoleic acid (CLA) to see if the fat, which is only found in cow's milk, can help the body fight viral infections and perhaps even reduce the growth of cancerous tumours.