My favorite one for a cold I tripped over by experimenting: Raw
   clove of garlic followed by some kind of source of vitamin C. It
   can be tomato, orange juice, VitC chewable, ,whatever. I was
   experimenting in "food opposites" and VitC got rid of the garlic
   burn [which I happen to like but 'its for science!" but I ALSO
   noticed my little cold seemed to go away. Had a few people tried
   it. Had similar effects to Zinc (which makes sense, 'cause Zinc
   and VitC use similar molecular areas). You get the symptoms but
   they're lighter and faster. It's like fast-forward on the cold
   and you can hardly notice it. I don't get colds very often at
   all. But I take Zinc a few times a week, just regular dosage.
   But anyway, the raw garlic + vitC works. There's something about
   that enzyme that gets released JUST as you bite into a fresh
   clove that's not present in preserved garlic.