Protein powder is a protein powder, usually made from purified soy protein, Casein, whey protein (L-Isoleucine) , pea protein or a combination of the above, a powder (such as a compound of soy protein, whey protein, and pea protein) used as a protein supplement for people who lack protein. For healthy people, protein deficiency doesn't usually occur as long as they stick to a normal diet. Milk, eggs, meat, soy, wheat and corn contain a wide variety of Essential amino acid in sufficient quantity and proportion. As long as we adhere to the food rich and diverse, the body can fully meet the needs of protein, there is no need to supplement protein powder. Moreover, the psychological enjoyment and sensory stimulation brought by food can not be replaced by protein powder. Too much protein intake is not only a waste, but also harmful to human health.