With the development of technology, the method of producing peptides is also constantly developing. In the 1950s and 1960s, peptides were mainly obtained from animal organs. For example, thymosin is produced by slaughtering the newly born calf, cutting its thymus, and then separating the peptide in the calf thymus by shaking biotechnology to prepare a thymosin injection. This thymosin is mainly used for human immunity. Today, this peptide is in a phase of elimination. The once-popular "mad cow disease" in the world, this virus mainly phagocytizes proteins in the brain of animals and destroys brain tissue, cells and nerves. Once the body is infected with the virus, it is more terrible than cancer, and eventually becomes a "vegetarian" or soon dies. There are also peptides extracted from human blood, and the side effects are also very large. It is not only easy to cause the human body to be infected with hepatitis A, hepatitis B, hepatitis C, hepatitis D, HIV, sexually transmitted diseases, but also has an allergic reaction. When it appears, life is at stake.