Our main services: Natural health supplements, The very best Slim wear, Information on health & fitness, Sports performance enhancers, Skin care and anti-ageing and Slimming and detox advice and info. Our immune system is our most important weapon for fighting off infection and illness, from the common cold to cancers. There are many factors influencing how effective our immune system functions, including age, diet, exercise, stress and vitamin D deficiency. The immune system is made up of a network of cells, tissues, and organs that work together to protect the body. The cells involved are white blood cells, or leukocytes, which come in two basic types.