A peptide is a chain of amino acids that have been bound together into a specific sequence, containing less than 50 amino acids. (More than 50 is a protein). When introduced into the body, the specific sequence of amino acids signals the body to perform an action.  The action performed by the body depends on the sequence of amino acids produced.  
For example, CJC-1295, is a peptide (a specific sequence of amino acids) that tells the body to produce more human growth hormone.  Due to physical stress, chemical stress (processed foods, toxins, etc), and emotional stress, the body has shut down its ability to trigger growth hormone. 

Peptides simply trigger the body to do something that it already knows how to do, BUT hasn’t been triggered to do for a period of time. Each peptide is designed to perform a specific function within the body.  Research has shown that peptides have the potential to address conditions including anxiety/depression, autoimmune diseases (RA, Lupus, Crohn’s, etc), chronic pain syndromes, neurological conditions, inflammatory diseases, organ disease (lung, liver, heart, and kidney) stomach ulcers, obesity, improve recovery after injury and surgery, anti-aging, natural tanning/pigment, and improved cognition.