Why is it important to drink an immune booster throughout the year? An immune booster/stimulant protects your body against all viruses and bacteria. Studies show that with the use of an immune stimulant you can shorten your illness period by as much as three to four days, therefor it is essential to always support your immune system. In the times we live in, your immune system is likely to be under tremendous pressure due to stress. That is why it is essential to drink an immune stimulant, and even better if your immune stimulant provides all your vitamins, minerals and amino acids at the same time.