1. Generally speaking, protein can only be absorbed by the human body after being digested by the liver and intestines, and nitrogen-containing substances such as urea, ammonia and inosine produced by its metabolism in the body are excreted by the kidneys.

2. When the human body decomposes protein into amino acids, it will produce a toxic substance: ammonia. The liver converts toxic ammonia into urea, which is sent to the kidneys and excreted from the urine. If there are too many amino acids to be metabolized, the levels of ammonia and urea in the body will increase, and the kidneys need extra efforts to excrete these urea.

3. In addition, the maximum absorption rate of whey protein in the intestine is about 8-65438 00g/hour, and the absorption rate of protein solution in the intestine is about 65438±0.5h Therefore, the actual whey protein that can be effectively absorbed is only about 15g, which is the amount of the general population, and the quality of eradication and digestion still fluctuates a little. Part of the remaining protein powder solution directly enters the large intestine and is discharged as waste; Some are oxidized or converted into urea in the liver, then transported to the kidney and excreted through urine.