LGD-4033 also known as Ligandrol, was originally developed for the treatment of muscle wasting conditions such as aging, osteoporosis, muscular dystrophy and cancer.

LGD-4033 is claimed to be a substance that induces muscle (and bone) growth without the side effects associated with steroid use. 

However, information on the safety of LGD-4033 is scarce due to a lack of medium and long-term clinical trials - hence the medium and long-term health impacts are unknown.

It should be noted that a number of Selective Androgen Receptor Modulators (SARMs) have associated health-risks, particularly for the heart and liver.