diet supplement products and lung cancer

Hi, After investigations(FNAC) ,it found that my mother 65 yrs old has lung cancer-adenocarcinoma grade II. she is having a multiple nodules in her right lung and out of which the largest nodule is of size approx 3 to 4 cm. it has also appeared that there is one nodule around liver of size approx 3 cms.As per my doctor the cancer is in advanced stage and needed to start treatment. this treatment includes combination of radiations and chemotherapy. As per my experience and knowledge the chemotherapy or radiation has other affects on human body and also is very painfull. so how to prepare the patient to take these radiations or chemotherapy so that it does not have other side effect on patient body. I have heard that few food supplemets(in form of gel or something) available in market claiming that they are good and very affective in cancer.like agel enterprise products EXO and UMI. are these products really good for cancer patient? PLEASE HELP ME IN TAKING DECISION WHETHER IS IT GOOD TO GO FOR ALTERNATIVE METHODS OF TREATMENT ALONG WITH THE CONVENTIONAL METHODS. Thanks Vin