Ibutamoren also known as MK677, is a growth hormone secretagogue. This simply means, MK677 is a chemical compound that works as a secretagogue and thereby promoting hormone growth so that the body can function at its optimal level. It is being used in the body and muscle building industry successfully without any side effects as far as we are aware.
Ligandrol was originally developed as a SARM to help with the cure and treatment of diseases like osteoporosis. However, its current primary use is to help in muscle mass or muscle repair. It is also a performance enhancement SARM though initially created to treat cancer and other conditions where patients are experiencing muscle waste and weakness.