The document discusses how to support and maintain a healthy immune system. It describes the major organs that comprise the immune system including the bone marrow, thymus gland, spleen, lymph nodes, tonsils, and intestines. It explains the two types of immunity and two types of lymphocytes that protect the body. Lastly, it provides recommendations for boosting immunity through essential oil blends, supplements, probiotics and lifestyle choices like diffusing essential oils at home.