Once you actually got the cold the best thing to put in your body is lots of greens and vitamin C. Ironically, if people got the nutrients from fruits and vegetables like they should, their immune system would never have to "fight" off infections, bacteria, virus',ect. the immune system would rid it right away.
I started taking "Green Super food" every day, which is a ton of veggies power packed in powder form and let me tell you, the difference is amazing. I'm like everyone else... I don't eat enough veggies.
The brand is pHion and I get it from LuckyVitamin.com for $30 in tablet form. You get 180 capsules and I take three everyday. I can feel the difference in my immune system already and I've only been on it 2 months. I've even been around sick people, and didn't get sick!