What are hormones? Hormones are chemicals that coordinate different functions in your body by carrying messages through your blood to your organs, skin, muscles and other tissues. Hormones are required for the normal development of animals, plants and fungi.

Hormones are chemicals made by glands in your endocrine system that travel through your bloodstream, delivering important instructions to your organs and tissues. The endocrine system uses hormones to control and coordinate your body's internal metabolism (or homeostasis) energy level, reproduction, growth and development, and response to injury, stress, Ò€¦