✔ 最佳答案
they are completely safe and extremely beneficial for your health. For the most part they come from milk and soy. They are all the good parts of the food without the saturated fats and sugars. They are also fortified with a whole bunch of vitamins and minerals, most of which are hard to come by. They are designed to build lean muscle and prevent any sort of unhealthy effects such as high cholesterol and body fat.