This is a description of 3 days smoothies. This is a description of a 3 day smoothie program. The immune system is the body’s incredible defence network against infections, viruses, and bacterias that enter the body. By making your immune system stronger means the less chance you have of getting sick and the faster you'll recover if you do. Follow this 3 days program and boost your immune system. ~ Shopping list, recipes, amazing photos and happy contents.