Peptides are short chains of amino acids, which are the basic building blocks of proteins. Peptides naturally exist in the human body and can also be found in foods such as meat, beans, wheat, and seafood. The human body naturally produces many peptides that participate in various physiological functions. For decades, scientists have been studying peptides and applying them in the medical field. Today, these powerful small molecules are increasingly gaining attention as potential tools for muscle recovery, weight management, improving skin health, and addressing aging-related issues.
Peptides are not a single substance but a large class of molecules with different structures and uses. Peptide drugs include insulin, GLP-1 receptor agonists, calcitonin, oxytocin, certain fertility drugs, and cancer therapies. Peptides are also used in skincare products and dietary supplements, claimed to support muscle building, sports recovery, weight management, and healthy aging.
While many traditional drugs work by blocking or altering biological pathways, peptide drugs often mimic the body's own signaling molecules. Pharmaceutical regulatory affairs expert Piyush Modi states that the main difference between peptide drugs and traditional drugs lies in molecular size and precision of action. Their structures are more complex and can precisely target specific biological pathways, making them potentially highly effective in appropriate situations. Currently, about 85 peptide drugs have received FDA approval, including GLP-1 therapies (such as semaglutide and tirzepatide), insulin analogs, teriparatide, and abaloparatide.
Administration methods for peptide products include oral, nasal, injection, and topical. Because peptides are easily broken down by the digestive system, many therapeutic peptides are administered by injection. To improve the absorption rate of oral peptides, researchers are developing delivery technologies such as polymeric nanoparticles and microneedles. Nasal administration allows peptides to be absorbed through the nasal mucosa and may act on the central nervous system via the nose-to-brain pathway; topical peptides are mainly added to skincare formulations, acting on local tissues.
Medical professionals typically determine usage duration by considering treatment goals, efficacy changes, side effects, and bodily adaptation. During treatment, monitoring may be needed for blood sugar, liver and kidney function, blood pressure, inflammation markers, as well as hormone levels like IGF-1 and thyroid hormones. Healthy habits like regular exercise may enhance the benefits of certain peptides. Peptide products continue to expand in fields such as medicine, skincare, sports recovery, and healthy aging, demonstrating broad application prospects.