To fully realize why peptides are among the fastest growing areas of medicine, you must understand how they work with our physiology, why they are superior to pharmaceuticals, and why they have the potential positively affect almost every disease-state imaginable. Peptides are small proteins or short chains of amino acids.  They are biological molecules that are found in every cell and tissue in our body.  They perform essential functions that keep our bodies performing to optimal levels, by linking together.  They have many functions in the body including signaling and messaging. Some may act like neurotransmitters, while others may act like hormones. They bind to receptors on the cell surface and tell other cells and molecules what to do. Biochemically speaking, they are biological molecules that once attached to a specific receptor, illicit a response at the cellular and potentially systemic level.  Basically, they act as signaling molecules with a specific task and purpose.  Since our bodies are already accustomed to peptides and recognize them, we are able to compound them, extending the half-life in the bloodstream so they do exactly what we want them to do.  This allows for targeted utilization for conditions such as increased performance, weight loss, speeding up the process of healing injuries, expediting fat loss, preventing chronic disease, supporting the immune function and increasing muscle growth.  Essentially, peptide therapy helps the body mimic the functions of naturally occurring peptides to emulate certain abilities on targeted areas.