The major excretory product in human beings is:

In human beings, the main excretory product is urea. During the breakdown of proteins in the liver, excess amino acids are converted into ammonia, which is highly toxic. To prevent harm, the liver transforms ammonia into urea through the urea cycle. Urea is then transported via the bloodstream to the kidneys, where it is filtered out and excreted from the body in urine. This process ensures that the main excretory product in human beings, urea, is safely removed, maintaining the body's chemical balance.