One of the many side effects of chemotherapy is that it weakens your immune system which is our repair system that keeps us health. So your main focus when undergoing chemotherapy should be to support the immune system by making some changes, especially with your food choices. There isn't a drug or a pill that will strengthen this system but only naturally way to achieve that. One of the many advantages of looking after the immune system during chemotherapy is there will be fewer consequences from the many side effects this treatment has. Also since all cancers are first caused by an immune system that wasn't functioning properly and allowed cancer cells to develop, doesn't it make sense to learn about it and what you can do to assist it? Firstly avoid doing anything that further weakens the immune system so cut down on alcohol, give up smoking which includes avoiding passive smoke, eat less dietary fats that are in fatty meats and butter, cheese and cream. Don't use c...