Hi welcome to HCm I have gone thru your query . Dear , Endura mass is a protein supplement . Of course ,not many side effects have been enlisted and can be taken for a limited time .I would like to suggest you ,to take banana and dates with milk in B/F It will not cause much problem until and unless you have kidney and liver disease. Too much protein overload ultimately is dealt with kidney and liver. If you are healthy person, no need to worry. It contains all the essential amino acids useful to build proteins in the body. But over use of unnatural products may harm your health in the long run. .I would like to suggest you ,to take banana and dates with milk in B/F Honey and alMonds also help gain Mass . One of the iportant strategies to achieve healthy body is a diet rich in fresh, raw whole foods .More of high Fiber, protein , fruit, egg fish ,fish oil for Omega 3, green leafy veges . quality, organic, biodynamic, locally-grown food will naturally increase immunity . To keep metabolism on right path to increase the strength of immune system , take all supplements full of antioxidant serve as antibiotics . For your info , Proper and sufficient diet including essential nutrients with exercise enhances the benefits .The food which we consume along with regular exercise is very important to enhance our immune system for sound physical & mental health and gives resistance from diseases . Avoid processed foods carbs , sugar , fried ,fast foods , Tea , coffee ,alcohol and smoking all will produce biochemical and metabolic conditions in your body that will decrease your immunity , so avoiding is definitely the first step in the right direction to detoxing the body, boosting the immune system . It is important to visit your physician for further advise . Hope this helps solves your query .Take care .All the best . Don t hesitate to co m e back in case of any further query .