There are a number of Homoeopathic remedies which if correctly chosen may help mitigate cold symptoms.
Personally I have found taking 1 gram of vit C 3 times a day for the first 3 days of a cold quite helpful.
But best of all has to be the old cure of a bottle of scotch and a strangewoman
I have a friend who gets a container and puts one large spoonful of honey in with the juice of 2 lemons, and grates half an ounce of ginger into it and covers with boiling water, strains and drinks it while still hot, good at the start of a cold.
And here's one for those who proliferate the views of UKA + sport england etc, get a large bucket of hot cow SH*te and stick your head in it