Anabolic processes tend toward "building up" organs and tissues . These processes produce growth and differentiation of cells and increase in body size, a process that involves synthesis of complex molecules . Examples of anabolic processes include the growth and mineralization of bone and increases in muscle mass. Endocrinologists have traditionally classified hormones as anabolic or catabolic, depending on which part of metabolism they stimulate. The classic anabolic hormones are the anabolic steroids , which stimulate protein synthesis, muscle growth, and insulin . The balance between anabolism and catabolism is also regulated by circadian rhythms , with processes such as glucose metabolism fluctuating to match an animal's normal periods of activity throughout the day. 
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Steroid use has also been found among people with a history of abuse or assault who wish to build muscles in order to protect themselves better. Steroid use is banned by the International Olympic Committee and many other amateur and professional sports organizations. But because drug testing is costly, tests of professional athletes are generally “random,” and are often preceded by a warning. Regular mandatory testing is standard only at the international level of competition.