Peptide or protein hormones are made up of amino acid polymers. Smaller peptide hormones are made up of 3-49 amino acid and larger protein hormones consists of 50-200 amino acids.
Most of the hormones produced by hypothalamus and pituitary are peptide/protein hormone like Growth hormone, prolactin, oxytocin released by pituitary are made up of peptides.
Some of the peptide hormones have carbohydrate group attached with proteins and are called glycoproteins for example luteinizing hormone is a glycoprotein hormone secreted by anterior pituitary which stimulate gonads to produce androgen.
