Protection of the immune system in the treatment of colds

The causes of the diseases are attacking the immune system of the individual in the treatment of colds. How can this be prevented in a natural way?

In equal proportion take ginger, carnation, cinnamon, pepper and galangal (blue ginger, Thai ginger) and mix it. One spoon of the mixture is put in a glass of water, boil it and drink it before bedtime.