The U.S. National Institute of Health (NIH) defines Hormones (such as Testosterone) as powerful chemicals that help keep our bodies working normally. The term hormone is derived from the Greek word, hormo, which means to set in motion. And that’s precisely what hormones do. They stimulate, regulate, and control the function of various tissues and organs.
Made by specialized groups of cells within structures called glands, hormones are involved in almost every biological process, including sexual reproduction, growth, metabolism, and immune function.