Table 3.

Classification of hormones.

Peptides	Glycoproteins	Amines	Eicosanoids	Steroid Hormones
Source: made up of amino acid residues	Source: conjugated protein bound to carbohydrate	Source: modification of amino acids	Source: small fatty acid derivatives with a variety of arachidonic acid	Source: derived from cholesterol
Short peptides e.g., Thyrotropin-releasing hormone (TRH). Intermediate peptides e.g., Insulin, and PTH	e.g., Thyrotropin (TSH)	e.g., thyroid hormones and catecholamines	e.g., Prostaglandins	Examples: Sex hormones, e.g., testosterone and estrogen Adrenal cortex hormones e.g., aldosterone, and cortisol
Short peptides		e.g., Melanocyte-stimulating hormone (MSH) Thyrotropin-releasing hormone (TRH)
Intermediate peptides		e.g., Insulin Parathyroid hormone (PTH)
Glycoproteins		Follicle-stimulating hormone (FSH) Thyrotropin (TSH)
Peptide-based hormones
Amino acid derivatives
Iodothyronines		Thyroxin (T4) Triiodothyronine (T3)
Amines		i.e., • Melatonin
Steroidal hormones
		Estrogens Testosterone (T) Cortisol Vitamin D