Yes I have hared of mega doses of Vitamin C helps slow it down big time. The following below have read about works well.
Lemon and Baking Soda go a long way too.
Raw Bitter Apricot Seeds
Flaxseed Oil with Cottage Cheese or skim milk
Drops of Food-grade Hydrogen Peroxide with Distilled Water
Spirulina
Chlorella
Barleygrass
Wheatgrass
Ozone
A high alkaline diet
Ozone
Coconut Oil
Bragg Apple Cider Vinegar
Coconut oil. We have a tub of it in the pantry and my wife hands me a spoon of it whenever I start getting the sniffles. So far it has worked really well — a whole season of not getting the flu for the both of us. If it can prevent the flu, then it can probably prevent cancer.
Or have good genes