The side effects are not great. Protein's excessive intake is not good for the kidney, because protein has a kidney, but it is not caused by protein powder. If you eat too much egg white, fish and shrimp will be bad, and it will be bad for your kidneys. As long as your muscles need it, eat it. Protein powder is more than 97% pure protein, which is not messy at all. General fitness protein powder is whey protein, which is extracted from wheat. No synthesis, fast absorption, no influence on digestion, and little burden on the body ~ ~ Whey is the English word for whey protein, and you must look at the variety when buying protein ~