A protein supplement is used to consume when you are having difficulty meeting your nutrient needs. For example, after a workout, you may need to go straight to work, and the time to eat is very short. Protein powders come in handy because you can easily have a small meal by drinking this in place of not being able to eat. This type of product is basically the same as eating protein-rich foods like chicken, beef, or even plants. Essentially, you are using protein supplements to provide the whole food nutrients you are not consuming enough of.