Steroid hormones – these are made from cholesterol.
Eicosanoids: these are lipid hormones – hormones made from lipids, kinds of fats. ...
Amino acid derived.
Peptides, polypeptides and proteins – small peptide hormones include TRH and vasopressin.
Amino acid derived. Melatonin works on the brain, and thyroxine acts on almost all cells in the body. Many of these hormones are neurotransmitters, hormones that one nerve cell sends to another nerve cell.