<s>[INST] my brother is suffering from CKD stage 3, his creatinine level i think its 56-64% .someone told us to drink wheatgrass juice? Does wheatgrass juice helps to patients of age 34years with CKD stage 3, who is undergoing chemotherapy too? are the side effects of chemotherpy really scarry...! please advice. [/INST] Wheat grass should not cause per se any problem with either chemo or to CKD. . However wheat grass juice is high in potassium and CKD patients are unable to remove this potassium and develop hyperkalemia ( high potassium) which is dangerous. Some chemotherapy medications can be stressful for kidneys should be monitored during and after chemo. The concept of everything natural is safe is so obviously fallacious - as if there are no poisonous plants or fruits in nature. All plants are also chemicals - simplest example is sugar (actually a chemical C6H12O6) extracted from sugarcane (natural) </s>