I think it is better to have mostly home made foods as much as possible. I try not to use protein powders for my son because there are usually ingredients he is allergic to. But you can use individual powders are add to the smoothie to make it healthy. For example I use L-glutamine powder and added to the smoothie. I use chia seeds and fiber immune. Those are to help with constipation so don't use if you don't have it. It is just the idea that you can find specific products and make your own smoothie. Bananas are good to if your body doesn't react negatively to it.