Modern researchers have shown that garlic, particularly fresh
raw garlic, has a broad spectrum of antifungal, antibacterial, and antiviral
effects. One
garlic clove (approximately 4 grams) eaten daily is a useful amount. If taken as a supplement, garlic should contain a daily dose of at least 10 milligrams of alliin.
supplement your multivitamin with more of the following: Vitamin A. For most adults (except pregnant mothers), 15,000 to 25,000 IU is an appropriate and safe level.