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Hormones are chemicals that are naturally produced in the body of animals and human beings and have a number of important functions in life, such as reproduction or growth. They act as messengers through the different parts of the organism and trigger and modulate key reactions to support and promote life. However, and due to the important role of these chemicals in several body functions, they also have been exogenously applied to animals and humans in order to obtain some kind of benefit in health or even to improve physical and growth performance. Focusing on the veterinary field, the most desirable action of hormones has always been reducing costs and obtaining more products of animal origin in shorter productive times, increasing the benefit per unit head for farmers. As a matter of fact, anabolic steroid hormones have played a key role among veterinary products in farming history and they have been one the most used and controversial components among veterinary drugs.

Natural Hormones in Food-Producing Animals:Legal Measurements and Analytical Implications