Some people believe that the over the counter  supplements sold to boost the immune system are helpful, there is no scientific research to support this. The immune system is an integrated group of cells. organs. proteins that function to protect, ward-off, and fight invading microbes. They work as a unit, much like a large organization.  A better strategy to boost or strengthen our immune system  are life style choices like diet, sleep, stress management, weight control, reduced alcohol, no smoking, exercise  and mindful meditation like T’ai Chi. Stay well, and Peace , Linda