| Hormone | Chemical nature |
| Pituitary hormone | These hormones are made up of polymer of amino acids and are peptide or protein in nature. |
| Epinephrine | It is a derivative of amino acid tyrosine and thus chemically are biogenic amines. |
| Endorphins | They are endogenous opioid neuropeptides. |
| Cortisol | It is the main glucocorticoid and is the derivative of cholesterol and is steroidal in nature. |