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The following doses have been suggested: 2 to 5 g of fresh raw garlic; 0.4 to 1.2 g of dried garlic powder; 2 to 5 mg garlic oil; 300 to 1,000 mg of garlic extract (as solid material); 2,400 mg/day of aged garlic extract (liquid). Take with food. Clinical trials have evaluated 180 mg of allicin daily for prevention of the common cold, and at least 5.5 g of raw garlic for the prevention of prostate cancer. Doses of garlic powder used in antihypertensive trials have ranged from 300 to 2,400 mg/day for up to 24 weeks. *