I think the doubling of vitamins really works. If you start to feel the snot dripping go for something with a decongestant as the more you drip the more you infect your body. I don't use cold & flu tabs (normal ones) for anything other than this.

Forgot to mention the Day & Night Lemsip has Echinacea, Zinc, Vitamin C and Garlic Oil for the Day and E, Z, C & Valerian for nighttime.