Our immune systems are constantly under pressure from illness, injury and stress. A weakened or vulnerable immune system has a reduced capacity to fight viruses and bacteria. Therefore a good diet and appropriate levels of vitamins and minerals are essential for increasing support. Those who are susceptible to infections can support the immune system with vitamins A, B6, biotin (B7,H), folic acid (B9), B12, C and D, mushrooms contain vitamin D2. Minerals such as zinc, selenium, magnesium, iron and copper, are also all essential micronutrients playing an important role in many physiological processes crucial for the proper functioning of the immune system. We should also consider other factors such as proper sleep, reducing stress and gut health. The microbiome (community of micro-organisms) is also an important modulator of the immune system both from within and outside the gut itself, so needs to operate optimally to establish balanced immune responses.