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Ligandrol (LGD-4033, VK5211) is an investigational selective androgen receptor modulator (SARM) being studied for conditions associated with muscle wasting, osteoporosis, and age-related muscle loss. Originally developed by Ligand Pharmaceuticals and later advanced by Viking Therapeutics, LGD-4033 is a non-steroidal compound designed to selectively target androgen receptors in muscle and bone tissue.