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Peptides are compounds that are formed by linking one or more amino acids with a covalent bond. These compounds are classified as polymers, because they typically link together in long chains. All animals on Earth have them in their body, and in a way, they are one of the building blocks of life.
There are two major chemical classes of hormones, peptides (proteins) and steroid hormones. Protein based hormones can be divided into three categories: proteins, peptides and amines. Their differences are essential with their size and what they are synthesized from. Peptides are compounds that consist of two or more amino acids; proteins are compounds that consist of 50 or more amino acids; amines are synthesized from the amino acid tyrosine.