Research just published shows that grapes are a good source of resveratrol, which is a cancer-preventive agent. Resveratrol is a potent cyclooxygenase (COX) inhibitor, which catalyses the formation of prostaglandins, which in addition to stimulating tumour cell growth, also suppresses immune surveillance. Research had earlier shown that resveratrol can inhibit tumour initiation, promotion and progression. Resveratrol is present in concentrations up to 100 microgram/ gram of fresh fruit skins ( Science , Vol 275, No 5297).