One of the best things you can do to keep your immune system healthy is exercise regularly. Studies have found that active people are less likely to suffer from respiratory tract infections like colds and pneumonia as well as bacterial infections.

There are thousands of supplements claiming to help the immune system. Some contain just one vitamin or mineral, and others are packed with a hodgepodge of ingredients. Vitamin D, vitamin C and zinc are among the most studied and prevalent ingredients, experts said, and the benefits still aren’t conclusive.

Medically reviewed by Sohaib Imtiaz, MD Though there are several immunity-boosting foods, a diet rich in citrus fruits has proved it can support your immune system and fight infection. Known for their vitamin C content,

We can boost the immune system by incorporating natural supplements such as zinc, vitamin D, garlic, mushrooms, and more into the diet.

Medically reviewed by Arno Kroner, DAOM The immune system is the body's defense against harmful germs and infections. It also responds to physical injuries, helping to heal wounds and repair tissue. The immune system contains specialized cells and proteins that help fight threats like disease-causing bacteria and viruses.