IGF-1 is one of the primary hormones necessary for cell growth in the body.
Many athletes use IGF-1 for its anabolic effect in muscle and to facilitate the development of cartilage and bone. In many cases, athletes will use hGh and IGF-1 in small doses to reduce the chances of returning a positive anti-doping sample, the ACC report says.
IGF-1 is also banned by WADA.
-- Mechano growth factor (MGF)
A variant of IGF-1, MGF leads to an increase in the muscle cells necessary for adult muscles to continue growth beyond their genetic limit. It is often used by bodybuilders due to its role in muscle repair following exercise.
Banned under WADA rules, MGF is also illegal to possess in many countries without a prescription.
-- Other substances
The ACC report also identified a number of other performance-enhancing substances -- some being prescription only medicines:
Ipamorelin and Sermorelin -- both peptides with anabolic effects, which are both prohibited by WADA.
Follistatin -- Promotes muscle growth. Banned by WADA, with its possession without legal authority is illegal.
Thymosin -- Used to speed up recovery from injury, it is an unregulated substance banned by WADA.