Peptides are pretty popular these days in the biohacker space. It’s a vague term basically meaning a molecule with under 50 amino acids. These molecules have a number of functions in our body mostly acting as messengers between your cells. There are 20 amino acids that are found in the human body of which 9 are essential and 11 produced in the body. 500 amino acids that have been identified in nature. Proteins are molecules that are composed of more than 50 amino acids. For example, insulin is a protein made up of 51 amino acids divided into two chains.