Echinchea capsules. You get them from Boots and similar places. Absolute wonder drug, better than any other cold remedy. Get it down you early tho as once it develops, your fucked!!!
Sorry but Echincea is nothing more than a placebo, its all in your head mate. There is no wonder cure for colds and flu, you just have to sit it out, drink plenty of fluids, eat sensibly and no wanking for 10 days. Next patient please!