For a cold? Personally I stopped eating processed foods and sugar and I have never had a cold again 2-3 years now. Sugar is awful and should be avoided.
If you are cold all the time you may have an underactive thyroid. Get a test done and they can sort you out.
TRy a good cheese and onion sandwich wit some added garlic for extra power, eat 3 times a day, works wonders for me, rely gets into your tubes, the onion/garlic should be at a strength that it makes your eyes water then its doin you some good.
And the best one, is the one before bedtime.
Good Luck
dayquil cough and cold is the best I have found