The first thing to know is that the immune system is a system that works together to fight against disease and illness. It is important to keep the whole system balanced and in harmony with itself. This can make it difficult to boost your system.
There are things you can do to help strengthen your immune system. One of the best things you can do is to choose a healthy lifestyle. Don't smoke, eat a diet high in fruits and vegetables, exercise regularly while maintaining a healthy weight. If you drink, only drink a little. Make sure you get enough sleep and wash your hands a lot as a way of avoiding becoming infected.
Unfortunately, there is an idea that you can buy a product which will help increase the number of cells that deal with keeping you healthy. This just won't work. The athletes who dope their blood to increase the number of blood cells run the risk of experiencing a stroke. As far as the immune system, there are so many different types of cells involved that increasing the number of cells cannot be done.
In addition, as we age, our body's response to infection becomes reduced. This means older people are more likely to become sick and die from them. One theory is that people lose T-cells as they age and it is the T-cells that are designed to fight off infections. This is supported by the fact that people who are over 65 when they receive a vaccination, do not produce immunity at the same rate as other ages.
Another issue is when people are under stress. Stress tends to inhibit the immune systems ability to protect itself. So as you can see, the best way to boost your immune system is to stay healthy, eat well, sleep well, exercise, and get rid of as much stress as possible.