Hi well anything that can help is always worth a look at. However as you will find out the amount of meds that you end up with whilst on chemo to counteract the side effects is mad so to add anything else that you take could be a bit much. But quite frankly I personally am open to anything. It does however get to the point where all your life becomes about Cancer and this alongside the intense brain fog that comes with chemo means it becomes difficult to take information in. Another tip for your son is to always tell the hotline nurses or oncologist about every little side effect as it makes a massive difference as they can give you meds that sort it out for the next cycle. 
regards Marc