UK scientists investigating how aged garlic extract reduces platelet aggregation say the supplement could significantly reduce the chances of heart attacks in heart patients.Dr Khalid Rhaman and colleagues from a nutraceutical research group at Liverpool John Moores University have previously demonstrated in a clinical trial that a daily supplement of Kyolic brand aged garlic extract inhibits platelet aggregation in healthy people. In a second trial reported two years ago they showed that it also reduces oxidative stress in smokers, people at high risk of heart disease.