Protein powder is not a drug, there is no absolute contraindication of the crowd, but liver and kidney disease, gout and other sick people need to be careful to eat, infants should not be eaten. Protein powder is rich in protein, and its main sources are plant foods such as soybeans and animal foods such as milk. After entering the human body, protein needs to be metabolized by the liver and finally excreted by the kidneys. Patients with liver disease, especially those with cirrhosis and liver failure, need to control protein intake under the guidance of a doctor to avoid excessive accumulation of nitrogen-containing substances or even hepatic encephalopathy. Protein products need to be excreted by the kidneys, if too much protein intake will aggravate the excretory burden of the kidneys, in addition, for patients who already have nephrotic syndrome, too much protein intake, may increase the degree of urinary protein. Protein powder contains a certain amount of purine, patients with gout need to choose carefully so as not to lead to elevated blood uric acid levels. Protein powder is not suitable for children under three years of age, is not conducive to digestion and absorption, especially infants, infants to breast milk as the preferred food, breast milk alternative food is segmented formula.