Doctors measured the vitamins, minerals and specialty supplements in the diets of 66,227 healthy men and women, aged 50 to 76. After eight years of follow-up, compared to those who did not take these supplements, those who took a daily multi-vitamin for at least eight years were 20 percent less likely to develop a hematologic cancer; for grape seed extract, 43 percent less likely; and for those who took garlic supplements at least four days per week for three or more years, 45 percent less likely.