★★★★★
When I feel a cold coming on, I usually take the following: 1/4 tsp garlic powder, 1/8 tsp cayenne pepper, and 1-2 tbsp of lemon juice. I recommend taking it like a shot, and chasing it with water. You should feel it working within a minute.
Another thing I do to stop colds is eat raw garlic. But it's difficult on the stomach, so I'll often toast a piece of bread, butter it, and slice some garlic. I lay the garlic on half of the bread, fold it over, and eat it. It tastes like intense garlic bread.