Garlic can turbo charge your immunity. The spice is a great source of sulfur, compounds that activate antibody production in 48 hours, boosting immune system strength by as much as 40 percent. The study proven doze? Aim for one clove a day. To enjoy the mild and creamy version, cut 1/4 inch off the top of a head of garlic, sprinkle with oil and salt, wrap in foil and bake 45 minutes at 350 degrees farenheit, then spread on crackers or tortillas.