How is histamine related to the amine family?

Histamine is chemically classified as an amine, which is a family of nitrogen-containing organic compounds derived from ammonia ($N{H}_3$).12

Within this chemical family, histamine is categorized as a naturally occurring amine. It is specifically formed in the body through the process of decarboxylation—the removal of a carboxyl group—from the amino acid histidine. As a biologically active substance, histamine functions as a local chemical mediator found in most animal tissues, where it plays a critical role in immune responses, inflammation, and neurotransmission.213